Text

Byron, Units 1 and 2, Response to NRC Request for Additional Information, Dated November 21, 2013, Related to the Byron and Braidwood Stations, Units 1 and 2 License Renewal Application, Byron Station Applicant'S Environmental Report. Part
	ML14007A094
Person / Time
Site:	Byron, Braidwood
Issue date:	12/19/2013
From:	; Exelon Generation Co, Exelon Nuclear
To:	; Office of Nuclear Reactor Regulation
Shared Package
ML14007A078	List: ML14007A080; ML14007A081; ML14007A082; ML14007A083; ML14007A084; ML14007A085; ML14007A086; ML14007A088; ML14007A089; ML14007A090; ML14007A091; ML14007A092; ML14007A094; ML14007A105; RS-13-282, Response to NRC Request for Additional Information, Dated November 21, 2013, Related to the Byron and Braidwood Stations, Units 1 and 2 License Renewal Application, Byron Station Applicants Environmental Report. Part 4 of 15;
References
	RS-13-282
	Download: ML14007A094 (348)
	v • d • e

Byron Environmental Audit -Request for Additional Information ResponseQuestion

HH-1 Category:

Human HealthStatement of Question:

Provide NPDES monthly discharge monitoring reports for the past five years.Response:

The NPDES monthly discharge monitoring reports for all months of years 2008 through 2012and January through July 2013 are provided.

List Attachments Provided:

1. NPDES monthly discharge monitoring reports for January 1, 2013 through July 31, 2013.2. NPDES monthly discharge monitoring reports for January 1, 2012 through December31,20123. NPDES monthly discharge monitoring reports for January 1, 2011 through December31,20114. NPDES monthly discharge monitoring reports for January 1, 2010 through December31,20105. NPDES monthly discharge monitoring reports for January 1, 2009 through December31,20096. NPDES monthly discharge monitoring reports for January 1, 2008 through December31,2008 Exelkn.Exelon Generation www.exeloncorp.com NucleatByron Generating Station4450 North German Church RoadByron, IL. 61010-9794 Tel 815-234-5441 February 19, 2008LTR: BYRON 2008-0013 File: 2.09.0411 1.1001 0-1Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number1L0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units I and 2. This report covers the period of January 1, 2008 through January31, 2008If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully,

/avid M. HootsSite Vice President Byron Nuclear Generating StationDMHIZC/sdk Attachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron 9NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 A0l 0PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIODPERMITTEE NAME/ADDRESS NAME Exefon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenvifle.

L 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadOCR0501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT-**NO DISCHARGE EJI RI MONTH I DAY I I YEAR MONTH DAYFrom: 1 0 1 l1To: 10 18 0 1 1 1 3 1 1Byron, L 61010NOTE Read instructions fore completi this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

..OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX AALYSISSOuDS. TOTAL SAMPLESUSPENDED MEASUREMENT (26) 2.3 2.3 19) 0 285 EC00530 1 0 0 Mt az- .- O4C/ -EFFLUENT GROSS VALUE E, .-' -.- ". ... .....MG/LCHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT

-26) (19) 50001032 1 0 0 ..! r M:.I '- : ,.. -.... ' -G EFFLUENT GROSS VALUE .D " " " MG/L ... .. ,CHROMIUM.

TOTAL SAMPLE 1 2)0(AS CR) MEASUREMENT

-(19)01034 1 00 /ý-PIEpyR e 414-LS/Y~~'-~~*

EFFLUENT GROSS VALUE ~ ~MG/L e~~lY~ GA'COPPER. TOTAL SAMPLE(AS CU) MEASUREMENT (26) -(19) 50001042 1 0 0 .'.- LBS/DY MG/I -. "..-EFFLUENT GROSS VALUE ., -... GILY, ' ..... M (" .GIRON. TOTAL SAMPLE 26)(AS FE) MEASUREMENT (26) (19) 50001045 1 0 0 ~T ~ ~ ~ LSD AAG~ .~EFFLUENT GROSS VALUE .=-1-.&- ........ 'YLEAD. TOTAL SAMPL(E26)19) 500(AS PB) MEASUREMENT (2_)_(19)_5_

_01051 1 0 0 1 -L.47D.Y -.0..EFFLUENT GROSS VALUE .-i-4 -. .... _,_.....___._D_._.__

.__NICKIEL.

TOTAL i SAMPLE(AS NI) MEASUREMENT (26) (19) 50001067 1 0 0 ": " ,.- MG -,S .LEIS/DY zEFFLUENT GROSS VALUE .:i &Ig4 M5*f'W 1; --PRINCIPAL EXECUTIVE OFFICER dirsdon Or supervmn accord wdh a system designed to assure 0, w -.-. TELEPH-IONE DATEpDPrvely

&w and evabtes ft fomu e bs-itted.

Basedanmynquy of the pesnorpars 815 406- 0 4David M. Hoots ,elo manage the s SrJAm. thMse pW'e direCs y isBxnse forgath mg te wrma the U02iftmatonmsubmnwed is, toth best afmykroege and bewf. e. acmne.s .anla a mp=ee. .ISGNATuREOFPRtNCPLE Site Vice President a- tamt athe asigrArt!alpenlties for sdubr"false rdama b-,dnmgq the Possabrdy of EXECUTIVE OFFICER OR A NUMBER YEAR MONTH DAYlW~t)OP~efD be Ond S ldmorUl nowing voatons.AUTHORIZED AGENT COOEJCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed 26 of 31 days during this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITIEE NAMEIADDRESS NAME Exaton Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, It 61010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT..NODISCHARGE MONITORING PERIODYEAR I MONTH I DAY YEAR ONTH DAYFromA 01 81 01 0 1 To:I 0 18 0 1 3 1 1 PERMITrEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvile.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DIRGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0049313 B01 0PERMIT NUMBER DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTP EFFLUENT (FORMER 0018)EFFLUENT*** NO DISCHARGE Y'TF- RBn n~-mtindI~fr mmltir Iis formI ,MONITORING PERIOD IYEAR I MNTH DAY I I Y I MONTH DAYFrom:I 0 8 10 1 1 0 1 1 To: o0 8 o0 1,13 11Ni1QUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISBOD. 5-DAY SAMPLE(20 DEG. C) MEASUREMENT 0.50 0.66 (26) 5.1 6.6 (19) 0 290 DC00310 1 0 0 Rof a4Z* 1M. -EFFLUENT GROSS VALUE MAIPHSAMPLE MAUE7.41

-7.62 (12) 0 290 GR00400 1 0 0 ..... ...... , ZL -. .0 -.EEFFLUENT GROSS VALUE ..,,QUIRSAENTl

__ --. I- .----" ; .SOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT 0.23 0.35 (26) 2.4 3.5 (19) 0 290 DC00530 1 0 0 ir RM1lp ý-4.2.3-8A .:a 0 .Mdoo~EFFLUENT GROSS VALUE E MOIEMEOtT

ýE7&A __~: YDL~A~MI

.FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.007 0.012 03) 0 135 CN50050.10 00 M ..G;..-" r-D .... ...EFFLUENT GROSS VALUE MG,- SAMPLEMEASUREMENT SAMPLEMEASUREMENT SAMPLEMEASUREMENT

_____ _____ ______________________

NAMPAL I car under pa of L tha Oft docut and al attacrts were p under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER dirction or In accord~ance with a systern delsgiged to assure Mal quafified personnel p'avi G oandoev-ale t informan subtd. Based an y inqiy o the person or pen 815 406-360 08 02 19David M. Hoots wto manrge the syalen1.

or thoew persoms rspoiUsle for gathe"rb thie infombar the f -r SN R F PRINC0PL1 rflmration subtleled is, to the best of my knowledge and belef, trMe. eatute, and orroete I m SGNMURE OF PRINCIPLEain Site Vice President ae thEat Onere am sgnificant penalties for submttng false lnfon., inchng the plsaiuyof EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYOR PftWM -- ne and -p- for knwin viowdions.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hem)1. Flow existed through this outfall 31 of 31 days during thi month.EPA Form 3320-1 (Rev 3M99) SD PAGE 1 OFi NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMrrTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERF -C01 0 dDISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALWWTP (FORMER 00IC)EFFLUENT* *NODISCHARGE i.. MONITORING PERIOD IYEAR IMONTHI DAY I IYEAR IMONTH IDAYjFrom: 0 1 8 1 0 1Ii 0 i l_1To:l 0 1 810 111 3 11NUTE R-ead instructions fore compl ina 1t11hi aQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS A.Y TYPE> < UNITS ANALYSISSOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (26) 1.6 2.5 (19) 0 240 DC00530 1 0- 0i p A ..-_LBS/DY .-- '- MG/I.L- .'CM2EFFLUENT GROSS VALUE Raka "T____ 0.A~GMX.CHROMIUM, HEXAVALENT SAMPLE 26) 1 500(AS CR) MEASUREMENT (26) (19) 50001032 1 0 0 01-*-*:-

-.MAYAEFFLUENT GROSS VALUE 7-EQUEUB,'N1

, -;;.. .........--.... : M -M) CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (26) -(19) 50001034 1 0 0 ;2-,- PEMM- PIP' DLY~ *REFFLUENT GROSS VALUE -.Q kU "" " -. .... >

7'--ýLY.

I..COPPER. TOTAL SAMPLE(AS CU) MEASUREMENT (26) -(19) 50001042 1 0 0 4- 1 -7 B/~y~~~:EFFLUENT GROSS VALUE REQUAAl; Yiii=~~.

~'IRON, TOTAL SAMPLE 26) 19) So0(AS FE) MEASUREMENT

_(26 -- (19)_50001045 1 0 0 ~~~0.EFFLUENT GROSS VALUE 3- ..--.-- .. ...' " .;". -...: ---MG- I-tDA WLEAD. TOTAL SAMPLE(AS PB) MEASUREMENT (26) -(19) 5000101100P~J:~LBS/DY MG/L.~'GA EFFLUENT GROSS VALUE AAREQUI.BAEN.X.i.4..T.

..-- .

' jy .AX, .- -NICKEL, TOTAL SAMPLE(AS NI) MEASUREMENT (26) -500EFFLUENT GROSS VALUE

" .__,.,.__

___ --NANCT I cetily -def pea^y of law Oa ft documew and a. a~ me worrepared under my, .TELEPHONE DATEPRINCIPAL EXECUTIVE OI~FFCER diction w or e, s on in acoRdance waT 8 system designed to ass-r 2a quahfed personnel

____i__.

_p rWoerty gat he an e e raur thoe pnm onabo sudinetu

d. TEapLu: o r gter i h the DAiED avid M .H oots who m a nage dm sy ,Sa ind O MY V" iaOnyf the pe am on the 815 406-3600 08 02 19SitomaVcT Puesitnt 1b .to the best Of my b ,*oldgea4 d S beW, au. a= gte. and MrneW lam 9IGNATU1E OF PRINCIPLE SiteDVicePrsident d

flse bnmab., the poseb EXECUTIVE OFFICER OR AR NUMBER YEAR MONTH DAYTWE CAmE PANTO e and i=smpraoenen" br knowaig .eon's. AUTHORIZED AGENT CODE___ _____COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all atechments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow exlsted through this outlfal 14 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 PERMITEE NAMEJADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, 60555FACILTY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. L 610100NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 Col 0PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIODYEAR MONTH DAY I YEAR MONTH DAYFrom:I 0 1 8 _i0 I oI IT°o: 1 018 0 1 1 31 1OCRO501MAJOR(SUBR 01)F -FINALWWTP (FORMER 081 C)EFFLUENT...NODISCHARGE--

NOTE: Read instructions 1efore comaItin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO FREQUENCY SAMPLEPARAMETER

'- OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS Ex ANALYSIS TYPEZINC. TOTAL SAMPLE 2)90(AS ZN) MEASUREMENT

{ 26) (19) 50001002 1 0 0 ~~__- ~ 1 ~.; _*' ~EFFLUENT GROSS VALUE -REOUI :,ENW' _________

.JL.....-..

.-WL Ro'tOI AD RESESAMPLE_

OILUANDEGREASE SAMPLE 1 26) 1.9 2.4 (19) 0 240 GREFFLUENT GROSS vALUE

.' MG/L Y.

FLOW. IN CONDUIT OR SAMPLET h R U T R E AT M E N P L N T M E A' S U R E ME N T 0. 0 3 0 0. 06 ( 0 3 ---- 0 13T505EFFLUENT1 GROSS0 VALUE Q

..-30

' , ;- .- .1 x .I MGD :p .j+. + ,' ... ,. .-:,.. .. .-+........

.... .. ....-:.-. -.... ,--- ._- .. ....- -,SAMPLEMEASUREMENT I..... ~~~ ~ ~ ~ "1b ...-....

EFFUUE EN GROSS VALUE" "r_ _.-. _-___._..-

.-_..,_---SAMPLEMEASUREMENT 0.030 0643)0 15TEPA- ... -SAMPLEMEASUREMENT.......__.,_..SAMPLEMEASUREMENT NAMErITLE I ceafy utr, peLrd ity of t lowat ttf document and aS aftameratwns prepoW waer my W TELEPHONE DATEPRINCIPAL

.XECUT'VE OFFICER kecbttn or eUPmrsiOn h accoroance WOth a system designed to assure tat qua&ted petsowtnpraply gather and evakba heW nomation submited.

Ba-d onmymqiaryofthe David M. Hoots VI manage th system. or th persors dirtsponue for gahst&g o m 815.40m0 08 02 19nfot uftind Is. to the beA of my Woedg ad bee, bus. atante.,

and =TO .lam 'SIGNA d OF PRINCIPLE Site Vice President aware that thre are alican penatiesfor suumittig let vtw.ma krtiAlng of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR nd f Iiitrlwn lwbbtw for .AUTHORIZED AGENTr -CODE,COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hare)EPA Form 3320-1 (Rev 3/99) -SO PAGE2OF NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAMEIADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarenvidle, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010L0048313PERMIT NUMBERF -D01 01 DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 001D)EFFLUENT* * 'NO DISCHARGE i]MONITORING PERIODYEAR MONTh DAY I I Y MONTH DAYFrom:1 0 8 a 0 1 0 I 1I To:I 0 I 8 I 0 I 1 I 3 1NOTE: Read Instructions before completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO.FREQUENCY PARAMETER

___ __O. OF SAMPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNrTS EX OF TYPESOLIDS, TOTAL SAMPLE 26) <O< 05 (19) 0 240 CPSUSPENDED MEASUREMENT (26)_<_0.4

<_0.5 19 024C00530 1 0 0 F I ------BS-D .-... ..3 D-ovEFFLUENT GROSS VALUE ORAEQOR .T .LD ..... .... AV. ... MG/L ý ...-W -__. __OIL AND GREASE SAMPLE 26) < 14 <14 19) 0 240 GRMEASUREMENT

( 6 ..1 ) 020G03582 1 0 0 !Z4 v5 m-'_ ...."- '2 ...EFFLUENT GROSS VALUE -R ----.z-:- <W M_- -.'.,EG.FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.022 0.023 (03) 0 135 CNEFFLUENT GROSS VALUE...

-.MGD.. :.. .- -. .SAMPLEMEASUREMENT SAMPLESAMPLEMEASUREMENT SAMPLEMEASUIREMEN PRtNOPAL EXECUTIE OFFCER dvd rapraa nacuac ihassenda mwirie to MU Wqafldpronl:EEHNATE

_ _......tim subrnviled is. tft baW of my knawledge mid beffr. mm, aioa. an -coiete -I ..-SIG,.NA U..RE OF PPRINCIPpLE

______ ______ _,_-__Site Vice President awareo11 ti here are signifcant penaites for subreitli false wdauinabwi.

ididgte possafity of EXECUTIVE OFFICER OR -UBRYA OT AD OR PNMAWSEM AUTHORIZED AGENT COD_COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hare)1. Flow eisted through this outfal 5 of 31 days during ite month.EPA Form 3320-1 (Rev 3619) SD mPAGE 1= 0 .I0 PERMITrEE NAMEJADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR) OCR0S01MAJORlL0048313 E01 0 (SUBR 01)PERMIT NUMBER DISCHARGE NUMBER F -FINALSTORUWATER (FORMER 001E)MONITORING PERIOD STORMWATER IYR N AY 1 YEAR MONTH I DAY IFrom: 1 0 T 8 o0 1 I0 1 o1"o: 1 0 1 8 0 1,1 3 1 1***NOOISCHARGE J-- "

PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0046313 I -E0I 0PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIODYEAR MONTH DAY I IYEAR MONTH DAYFrom: -0 8 a 0 1 1. 0 11 To: 1 0 8 8 0 1 1 3 1 1 1OCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORM WATER* *

NO DISCHARGE I- oNOTE: Readinsrrctions fore comyoetino his formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS TYPENICKEL, TOTAL SAMPLE 26) 500(AS NI) MEASUREMENT (19)01106 1 0 0 .LBS/Oy .. ....EFFLUENT GROSS VALUE U MG/AZINC. TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19) Soo01092 1 0 0 ~ n-__ GI !AY~~GAEFFLUENT GROSS VALUE tWRQ)Rd~

LBSI- G,________

L. -_____- __ _______OIL AND GREASE SAMPLEMEASUREMENT (26) <1.4 < 1.4 (19) 0 290 GR03582 1 0 0 "M.- _--'L"M'-.

MG/I-' T , -:EFFLUENT GROSS VALUE

_- _ _______'

_ '"-"_ .G --WLY. 1, _, _ ,_FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.011 0.012 03) 0 290 TM50050 1 00 ~ E MT ~QT 1ý7 -9RT~ O '~'r--..EFFLUENT GROSS VALUE " , .GD Z. , n-.-'--.

-- l-'" ., :l_...--..

SAMPLEMEASUREMENT SAMPLEMEASUREMENT SAMPLEMEASUREMENT I crwuynde penalty of l that iOts domauent and at ataclnts

-- e under my 4 * / TELEPHONE DATEPRINCIPAL EXECUrVE OFFICER dfcton or upervisin in accordance Wth a systafn desgned to assute tat qualified personnel TEEPON DATEDavPidygaierandevaueth rmkonsubmited.

Based an-815 40m-3600 0 02 19David M. Hoos who anage the oa t"ose permons dirly mspoma for ft rdorrn, t5 : 08 02 19idcmallan subIted t.is. to the best od my Wwiedge and belet. fus, accurate, andomlete lant SINA'tURE OF PRINCIPLE Site Vice President wamre twa ow. am ,ig peWalt=e for seuttlgt ftase mfnation.

tnit te of EXECUTIVE OFFICER ORT__ OR PRLM fine and hipvmnien for kncwmg violation.

AUTHORIZED AGENT ]ODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMrITEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACLITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBER001 0 dDISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALCOOLING SYSTEM BLOWDOWNEFFLUENT***NO DISCHARGE

[ ]MONITORING PERIODYEAR MONTH DAY I EAR MONTH DAYFrom: 0 I 8 0 1 0 1 To: 0 I8 0 1 1 13 1 1,1COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference allattachments here)Per Special Condition 4C.. the maximum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHED PERMnTrEE NAMEIADDRESS NAME Exfdon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadNATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 002 0PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIODYEAR MONTH DAY I YEAR MONTH r DAYFrom: 0 1 8 0 1 1 0 1 1 I To:I 0 1 8 0 I 1 1 3 1 1OCRO501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER NO DISCHARGE r ...Byron. IL 61010NOTE. Read instrctions fore completin Ihis formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQECY SAMPLEPARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISPH SAMPLE 12)MEASUREMENT 00400 1 0 0 r'e r ... .i EE. -.EFFLUENT GROSS VALUE :4REOMETI.,

- T~ t~W~ ~9 AX U ;. -~---SOLIDS, TOTAL SAMPLE 26_9SUSPENDED MEASUREMENT (26) (19)00530 1 0 0 ..- `SEE'-.--*

-DA- -..,ABEFFLUENT GROSS VALUE _.REWtJIENB

___. _ _ ______ LB___ _____. -.3AYVG. ':DAILYMA..

_____ ;.U-I.CHROMIUM.

HEXAVALENT SAMPLE 26) 19)(AS CR) MEASUREMENT EFFLUENT GROSS VALUE .-"0ipA.Ay.,:-

i DLV.A -"CHROMIUM.

TOTAL SAMPLE 26) 19)(AS CR) MEASUREMENT (26) (19)01034 1 0 0 .-=. .1 1. ..EFFLUENT GROSS VALUE jm .".---.,..

..M.COPPER TOTAL SAMPLE 26_9(AS CU) MEASUREMENT (26) (19)01042 10 0'(Z S7.777N*M LBSoDY 1 o-. - .... -..EFFLUENT GROSS VALUE ,,___. ___ 06a....__

IRON, TOTAL SAMPLE(AS FE) MEASUREMENT (26) -(19)01045 1 0 0 f

--M... ....EFFLUENT GROSS VALUE. ' .0.. .,.'.' -".., ._LEAD, TOTAL SAMPLE 12)9(AS PB) MEASUREMENT

-(19)01051 1 0 0 4": -' .....Y- -0G.I" " ....EFFLUENT GROSS VALUE ,IEUAET , 7. .YAIY NAKm.E I certiy undear penafty of law da this doaxment and alt attactnwn vwee pvpr under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER dincbIn or SUPerlvlon in accortance

%if a system desgtned to asfu that quafified personne_

Davi 9~ Hot orlev 0the8 02fTn1submt9ed an do p,-rn or 060David M. Hoots who manag Ow systen or Wmose pemons dmctly responsie for auteinog the hrin4a66-3he 08 02 19nimoabn aftuned is. to the best of my Mraowmmige and besef. tee a=urw, and coms e Ie am SIGNA RE OF PRINCIPLE Site Vice President swamOm two ar sgp pan tw un fal M fte p ft ofa EXECUTIVE OFFICER OR E NUMBER YEAR MONTH DAY1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. This discharge point was not used this month.EPA Form 3320-1 (Rev 3199) So PAGE 1 OF 20 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 FME002 0 _EPERMIT NUMBER _d I DISCHARGE NUMBERPERMnrTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

U 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010OCROS01MAJOR(SUBR 01)F -FINALSTORMIWATER RUNOFF BASIN OVERFLOWSTORMWATER

.NO DISCHARGE

[ MONITORING PERIODI YEAR IMONTHI DAY I I YEAR I MONTH I DAYFrom:l 0 1 8 1 0 1 0 1 1 I To:1 0 1 8 1 0 1 1 3 1 1INOTE- Read instructions before corn mlt this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISNICKEL, TOTAL SAMPLE 26) is)(AS NI) MEASUREMENT

_26)_____

01067 1 0 0 ". .-...o ..--.-0. -.LBS/DY ~--2> ~ ~ -~MG/L ..AY- 2GABEFFLUENT GROSS VALUE % i tk , _____-30DYAG'__

__- .ZINC. TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19)0109 1 0 0 :7- B/D MG IGRAEFFLUENT GROSS VALUE W ~ ~ ~DA.V. ;. .. 4 4X-4; -OIL AND GREASE SAMPLE 26___MEASUREMENT (19)03582 1 0 0 77 -C-LB /D -zV'1 ... W ,-': -EFFLUENT GROSS VALUE

,"' )4" .L .

.... r A ,t u G-ABFLOW. IN CONDUIT OR SAMPLE rTHRU TREATMENT PLANT MEASUREMENT (03)EFFLUENT GROSS VALUE.. r..,.G v ..-,'.,-SAMPLEMEASUREMENT,

-i. -.% _ + : + .'..,----

.... .4 .. .. .4-.,.-*.4~--..4.,-4

...-... 4,,4_. ;.. , ., SAMPLEMEASUREMENT SAMPLEMEASUREMENT 9 , ** _ _ -- _ --l k' '.4-'- --. -. .4- J..--" ' --' 4.--- 4 -,. ..: :. --... ..: ..... --.-r ..- .NAMEIrt.L I cewfy wider pertay of law tVot Mte dmomid and aH srtla ant 'm ixWed under my TELEPHONE DATEPRINCIPAL OFFICIER damecion at supervsion in accordance with a system designed to asure tat quafiied pewrwon I___IDaoperty gah and evaie ekinformaton sulmitted.

Based on my quw othe pe-sm peO 815 406-3600 8 02 19David M. Hoots whom marum toe 3~tam, of uVose pwmans dkoctly fof 93aýtoe~

irdr fnm ti, e0021Infombnain suinted is. to the best of my knoetedge and befie. true, accurate and complete I am SIGNAZ_;_J

_OPRINCIPLE SiteVimce President wa matthee arm sigica penalies for subttig falee, irmistion.

cbmudb the possasfty of EXECUTIE OFFICER OR R NUMBER YEAR MONTH DAY" ntE arnd impmismn for knowRn vlio I AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hem)EPA Form 3320-1 (Rev 3/99) SD PAGE 2OF 2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 January 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)01/05/0801/12/0801/19/0801/26/0812012012012071.765.756.771.9Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MOITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharge to the Cooling System Blowdown during themonth of January 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byrch~byrondb\clcrk\MontIh1yDMR\attach~t\Jan08 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 January 2008COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.k: byrh~yrondb\clerk\MonthdyDMR\attachO I VanOS EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

(Minutes) uA- U-2 _U- U-201/01/08 15 15 01/08/08 18 1601/02108 0 0 01/09/08 15 1501/03/08 0 0 01/10/08 19 2001104/08 0 0 01/1 1/08 20 2001/05/08 33 40 01/12/08 20 2001/06/08 20 20 01/13/08 20 2001/07/08 17 18HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 0 1/07/08Time: 11:23Analyzed by: ID.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26&L 0.240.220.200.180.160.140.120.100.080.060.040.020.00-Hz~-- ~Z~ZZK0255075Minutes100125150o EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-_ 20l/14/08 20 2001/15/08 20 2001/16/08 20 2001/17/08 20 2001/18/08 20 1901/19/08 20 2001/20/08 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 0 1/14/08Time: 11:21Analyzed by: T. B. M.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mgtL. Allvalues less than this limit are reported for information only.0.50 -1 1 - ------------------0.48 -1 1 -------0.46-0.44 -0.42-0.40-0.38 ---0.3660.3440.322-0.300-0.288E 0.26-z----------------

0.24----0.22 ---0.20-0.18 -------0.16 0-- -----0.14-/0.120.10 ? -0.086---0.06 --- -0.04 ---0.02 ---0.0010255075Minutes100125150 EXELONBYRON STATIONPermit EL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosine Time(Minutes)

U-_ U-201/21/08 20 2001/22/08 20 2101/23/08 20 2001/24/08 20 2001125/08 18 1901/26/08 20 2101/27/08 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 01/22/08Time: 10:29Analyzed by: G. S.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26&, 0.240.220.200.180.160.140.120.100.080.060.040.020.000255075Minutes10012515i0 0 PEXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date DosinE Time(Minutes)

U-I U -201/28/08 20 2001(29/08 20 2001/30/08 20 2001/31/08 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 01/28/08Time: 13:00Analyzed by: J.P.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.EC.C.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00zzz---------------------

-ii ---t- -0255075Minutes100125150 Exelon Generation Company.

LLC www.exeloncorp.com NuclearByron Station4450 North German Church RoadByron, IL 61010-9794 March 17, 2008LTR: BYRON 2008-0023 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number1L0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units 1 and 2. This report covers the period of February 1, 2008 throughFebruary 29, 2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley damsPlant ManagerByron Nuclear Generating StationBA/ZCAttachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron F.NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMIT-EE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winlield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBER[ MONITORING PERIODj.YEAR IMONTH IDAY IYEAR IMONTH IDAYOCRO501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT* NO DISCHARGE From:L 0 I 81 0 1 2 1 0 I 11To:l 0 1 8 1 0 1 2 I 2 1 9NOTE: Read instructions fore completing is formQUANTITY OR LOADING QUANTITY OR CONCENTRATION N FREQUENCY PARAMETER OFTYNOAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPESOLIDS. TOTAL SAMPLESUSPENDED MEASUREMENT (26) .1.9 1.9 (19) 285 EC00530 1 0 0 PERMIT LBS/DY 15.0 30.0 ONCE/EFFLUENT GROSS VALUE REQUIREMENT

_____ 30 DAY AVG DAILY MAX MG/L MONTH COMP-8CHROMIUM.

HEXAVALENT SAMPLE 26) 19) 500(AS CR) MEASUREMENT (2_)_.......__19)_500 01032 1 0 0 PERMIT LBSDY 0.1 0.2EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MG/L DALY GRABCHROMIUM, TOTAL SAMPLE 26) 19) 500(AS CR) MEASUREMENT (2_)_(1_)_50_

01034 1 0 0 PERMIT _.__DY1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT LBSDY 30 DAY AVG DALY MAX MG/. DAILY GRABCOPPER, TOTAL SAMPLE (26) 19) 500(AS CU) MEASUREMENT (2____19)_500 01042 1 0 0 PERMIT 0.5 1.0EFFLUENT GROSS VALUE REQUIREMENT

--S/ 30 DAY AVG DALY MAX MG/I DALY GRABIRON. TOTAL SAMPLE (19)(AS FE) MEASUREMENT 01045 1 0 0 PERMIT -LBS/DY .0A-- LS/DYMG/L DAILY ':GRAB.EFFLUENT GROSS VALUE REQUIREMENT 30DAYAVG DAILYMAXLEAD. TOTAL SAMPLE --- 26) -(19) 500(AS PB) MEASUREMENT 01051 1 0 0 PERMIT .Y0.2 0.4EFFLUENT GROSS VALUE REQUIREMENT Y " 30 DAY AVG DALY MAX MG/I. DALY GRABNICKEL. TOTAL SAMPLE (26) -- (19) 500(AS NI) MEASUREMENT 01067 1 00 0 PERMIT -LBS/DY 1.0 2:0 MG/L DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT I' _ 30 DAY AVG DAILY MAX ML I ._NAMEITITE I cartiy under penalty of law that this document and anl attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supervision in accordance with a system designed to assure that qualified personnel propedy gather and evaiute the infortation submitted.

Based on my inquiry ot the pers or persons 8151406-3700 Bradley Adams who manage the system, or those persons directly responsible for garnering the inormation.

the 08 03 17information submitted is. to he best of my knowledge and belief, true, accurate.

and complete.

I am SIGNATUIE A E CRINCIPLE Plant Manager a a th'at there are significantpenaties fr subm~tmg flse infom~at`ionincluding the possiblity o EXECUTIVE OFFICER OR AR A NUMBER YEAR MONTH DAYTYPED ORt PRINTED fin and imrn sionment for knowving violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed 20 of 29 days during this month.EPA Form 3320-1 (Rev 3/99) SO PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010.IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBERMAJOR(SUBR 01)F- FINALDEMINERAUZER REGENERATE (001A)EFFLUENT..NO DISCHARGE MONITORING PERIODYEAR MONTH DAY I IYEAR MONTH DAYFrom: 018 2 0 1 I To:10 8 0 2 2 9NOU TE: Read instructons eore competing this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC, TOTAL SAMPLE 26) 19) 500(AS ZN) MEASUREMENT 01092 1 0 0 PERMIT 1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT Y 30 DAY AVG DAILY MAX MG/L DAFLY GRABFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.011 0.066 03) 0 135 CN50050 1 0 0 PERMIT REPORT REPORTMGD DAILY CONTINEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXSAMPLEMEASUREMENT PERMIT.REQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT "I*I~rTLE I certify under penally of law that this docuimenit and alt attachments were prepared under my /TLPOED EPRINCIPAL EXECUTIVE OFFICER direction or supervisIon in accordance with a system designed to assure that qualified personnel TEEHNEDTproperty gather and evatute the inlorumatro submitted.

Based on my inquiry of the person or persons 815 406-3700Bradley Adams who manage the system, or those persons directly responsible for gatherng the Inlonation.

the 08 03 17inlormation submitted is. to the best of my knowtedge and bailet, true, accurate, and complete.

I am SIGNATURE OF PRINCIPLE Plant Manager aware that there are significant penalties for submitting false inlonnatiof.

including Ore possibtty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYlYE OR PFimED fine and ,nprisionment for knowing viiations.

AUTHORIZED AGENT CODE "COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 21 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDESDISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Wintield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERB01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALSTP EFFLUENT (FORMER 0018)EFFLUENT*

NO DISCHARGE F-1MONITORING PERIODi YEAR IMONTH I DAY YEA MONTH IDAYFrom: 0 I 0 1 0 1 21 0 1 To:0 8 0 2 2 1 9NOTEI -: Read insnco1on1 fore completn ths form11QUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEBOD, 5-DAY SAMPLE(20 DEG. C) MEASUREMENT

<0.34 <0.50 (26) ...... <4.4 <6.6 (19) 0 290 DC00310 1 0 0 PERMIT 14.2 28.5 30.0 60.0 TWICE/EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX IBS/DY 30 DAY AVG DAILY MAX MG/L MONTH COMP24PH SAMPLEMEASUREMENT 6.84 7.47 (12) 290 GR00400 1 0 0 PERMIT 6.0 9.0 TWICE/EFFLUENT GROSS VALUE REQUIREMENT

.... MINIMUM MAXIMUM SU MONTH GRASSOUDS, TOTAL SAMPLESUSPENDED MEASUREMENT 0.093 0.11 (26) 1.2 1.4 (19) 0 290 DC00530 1 0 0 PERMIT 14.2 28.5 .BS/DY 30.0 60.0 J TWICE/EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX .30 DAY AVG DAILY MAX MG/MONTH COMP24FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.007 0.015 03) 0 135 CN50050 1 0 0 PERMIT REPORT. REPORTMGD ...DAILY CONTINEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXSAMPLEMEASUREMENT PERMITREQUIREMENT

_ _._..SAMPLEMEASUREMENT

-PERMITREQUIREMENT

_SAMPLEMEASUREMENT_

PERMIT'REQUIREMENT NAME/TITLE ceruty under penalty of law that this document and asi attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or superismon in accordance with a system designed to assure that qualified personnel property gather and evatute the information submitted.

Based on my inquiry of the person o personsBradley Adams who manage the system, or those persons directly responsible for gathering the information, the 615 4 6-37 08 03 17information submitted is, to the best o1 my knowledge and belief, true, accurate, and complete.

tar SIGNAT*9 OF PRINCIPLEa Plant Manager aware da there ate sgnificant penalties for submitting false inftoration.

including the possibtity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTWme OR PROED rin and imprnsronment for knowing violattios.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments heee)1. Flow existed through this outtall 29 of 29 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERCol 0DISCHARGE NUMBERMONITORING PERIODYEAR MONTHI DAY I I YEAR MONTH DAYOCR0501MAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENT.NODISCHARGE From: 0 l8 1 0 12 10 1 1 ITo:10 18 10 12 12 1 9NOTE: Read instructions before completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPESOLIDS. TOTAL SAMPLESOLIDS,...TAL(26)

SAMPE 1.6 3.0 (19) 0 240 DCSUSPENDED MEASUREMENT 00530 1 0 0 PERMIT LBS/DY15.0 30.0EFFLUENT GROSS VALUE REQUIREMENT LBSIDY 30 DAY AVG DAILY MAX MG/L WEEKLY COMP24CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19) 50001032 1 0 0 PERMIT LBS/DY 0.1 0.2 DALY GRABEFFLUENT GROSS VALUE REQUIREMENT 30DAYAVG DAILY MAXCHROMIUM, TOTAL SAMPLE (2) --- (19) 500(AS CR) MEASUREMENT (26)_19_50 01034 1 0 0 PERMIT .LBS/DY 10 2.0EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXCOPPER, TOTAL SAMPLE(AS CU) MEASUREMENT (26) (19) 50001042 1 0 0 PERMIT ____Y0.5 1.0EFFLUENT GROSS VALUE REQUIREMENT LBS/DY30 DAYAVG DAILY MAX MG/L DAILY GRABIRON, TOTAL SAMPLE 26) 19) 500(AS FE) MEASUREMENT (26)_(19)_50_

01045 1 0 0 PERMIT..

1.0 1.0EFFLUENT GROSS VALUE REQUIREMENT LBS/DY -- 30 DAY AVG DAILYMAX MG/IL DAILY GRABLEAD. TOTAL SAMPLE (26) ..19) 500(AS PB) MEASUREMENT (26)_........_(_9)_500 01051 1 0 0 PERMIT LBS/DY .02 0.4 MG/I DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXNICKEL. TOTAL SAMPLE (26) ------- 19) 500(AS NI) MEASUREMENT (26)_(19)_5__

01067 1 0 0 PERMIT LBS/D 1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DALLY MAXNAEI.E I certify under penalty of law that1 thes document and all attachments were prepared under my/1TLPOEDE PRINCIPAL EXECUTIVE OFFICER directon or supervision in accordance with a system designed to assure trial qualified personnel TE DATproperty gather and evalute the information submitted.

Based on my inquiry of the person or persons, 815 406-3700Bradley Adams wlto manage lie system. or those persons directly responibe for gatherig the information, the 815 -a n'. 08 03 17infomialion subritted is. to the best of my knowledge and belief, true, accurate.

and complete.

tan SIGNATJ OF PRINCIPLE JjPlant Manager aware that there are significant penalties for submitting false information.

including the possiblity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTHTYPED OR PRNTED Ifne and imprisionment for Inowing violations.

AUTHORIZED AGENT CODE NUMBER YEAR MONTHDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this outlall 18 of 29 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMIT-EE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERCal 0oDISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALWWTP (FORMER ODIC)EFFLUENT* NO DISCHARGE IMONITORING PERIODIYEAR IMONTH I YEAR IMONTH I DAYFrom:l 0 I 8 I 0 1 2 I 0 11 I To:l 0 1 8 1 0 1 2 1 2 1 9 1i i i I I I INOTE: Read instructions before completing this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO FREQUENCY SAMPLEPARAMETER N. OF SAMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT (26) ...... (19) 50001092 1 0 0 PERMIT LBS/DY1.0 2.0 MG/L DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT LSDY_" 30 DAY AVG DALLY MAX M__L____LY GRABOIL AND GREASE SAMPLE ----(26) 240 GRMEASUREMENT

<1.7 2.2 (19) 003582 1 0 0 PERMIT 15.0 20.0EFFLUENT GROSS VALUE REQUIREMENT LBS/DY 30 DAY AVG DAILY MAX MG/L WEEKLY GRABFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.032 0066 (03) ............

0 135 TM50050 1 0 0 PERMIT REPORT REPORTEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MGD ----DAILY TOTALIZ.SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT NAMlRTE I certify under penalty of tare that this doctument and all attachments were prepared under myr TELEPHONE DATEPRINCIPAL EXECUTIVE OFRCER direction or supervson in accordance with a system designed to assure Slat qualifid personnel Property gather and evaluta the information submitted Based on my iequiiy of the person or persons t 815 406-3700 03Bradley Adams who manage the system. or those persons directly responsible for gathering the inlorrmation.

te SINT_._.OF:08 07information submitted is. to the best of my knowledge and belief, true, accurate.

and complete.

I am SIGNATU OF PRINCIPLE Plant Manager aware that there are signirfiant penalties for submitting false inforttaon, induding the possibleiy of EXECUTIVE OFFICER OR AREA"PED OR PRIMED tire and binpisionment for knowing violations.

I AUTHORIZED AGENT CODE NUMBER YEAR MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2 NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER001 0DISCHARGE NUMBERMONITORING PERIODYEAR I MONTH A I YEAR MONTH DAYOCR0501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 001D)EFFLUENTNO DISCHARGE From: I0 1 8 10 12 10 11 iTo: I0 18 10 12 12 19NOTE: Read irtructions before comoIetin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. OQEPNEPARAMETER

____N. OF SMLAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPESOLIDS. TOTAL SAMPLE <0.6 0.9 19) 0 240 CPSUSPENDED MEASUREMENT_

00530 1 0 0 PERMIT LBS(DY 15.0 30.0 MGL WEEKLY COMPOSEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX.OIL AND GREASE SAMPLE (26)---1-26)

<2.1 3.3 19) 0 240 GRMEASUREMENT

...... _26__<2.1_3.___9)__40__

03582 1 0 0 PERMIT 5LBSDY 3 .0 DAY ADLM WEEKLY GRABEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 PERMIT REPORT REPORT MGD DAILY CONNEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXSAMPLEMEASUREMENT

.PERMITREQUIREMENT

_SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT

.PERMITREQUIREMENT

__________

____NAMEJTITLE I certiy under penalty of law that this document and all attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER directon or supervision in accnance with a system designed to assure that qualified personnel properly gather and evalute toe information submitted.

Based on my Inquiry of the person or personsBradley Adams who manage the system, or those persons directly responsible for gathering the information, the 08 03 17information submitted is, to the best of my knowledge and belief. true, accurate, and complete.

I am SIGNATLE OF PRINCIPLE Plant Manager aware that there are significant penalties tor submiting false information.

induding the possiblity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPEO OR PRINTED I fne and imprsionment for knowing violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. Flow existed through this outlall 4 of 29 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 10 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, I.L 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERE01 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORMWATER

.* NO DISCHGE[MONITORING PERIODYEAR MONTH DAYI YEAR MONTH DAYFrom: 0 8 0 12 0 1 To: 0 81 0 2121 l 9NOTE: Read instctions fore completng this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FSAMPLEPARAMETEROF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEPH SAMPLE ----- -- (---12) 500MEASUREMENT

"__"___12)_500 00400 1 0 0 PERMIT 6.0 9.0 SEEEFFLUENT GROSS VALUE REQUIREMENT MINIMUM MAXIMUM PERMIT. GRASOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (26) (19) 50000530 1 0 0 PERMIT -t 15.0 30.0 MG/L SEEGRABEFFLUENT GROSS VALUE REQUIREMENT

____.___DY 30 DAY AVG DALY MAX PERMITCHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT 01032 1 0 0 PERMIT .BSIDY 0.1 0.2EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MG/L DALY GRABCHROMIUM, TOTAL SAMPLE (26)-----26(19) 500(AS CR) MEASUREMENT 01034 1 0 0 PERMIT " /Y -1.0 2.0LBS/Y MGL DALY ' GRABEFFLUENT GROSS VALUE REQUIREMENT

--30 DAY AVG DAILY MAX MG/LCOPPER, TOTAL SAMPLE 126) 19) 500(AS CU) MEASUREMENT 01042 1 0 0 PERMIT L Y0.5 1.0 MG/L DAIL.Y " GRASEFFLUENT GROSS VALUE REQUIREMENT

-___30 DAY AVG DAILY MAXIRON, TOTAL SAMPLE (26) 19) 500(AS FE) MEASUREMENT 01045 1 0 0 PERMIT LBS/LY 1.0 .1.0 MG/L DALY GRABEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MG__A___

RALEAD. TOTAL SAMPLE(AS PB) MEASUREMENT (26) (19) 50001051 1 0 0 PERMIT LBS/DY ---- 0.2 0.4EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MG/L DALY GRABNAMFTITE I certify under penalty of law tra this document and all attachments were prepared under my .//I TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supervision In accordance with a system designed to assure that qualified personnel

_property gather and evalute the inlormation submitted.

Based on my inquiry of the peron or persons 815 406-3700Bradley Adams who manage the system. or those persons directly responsible tor gathering the information.

the 08 03 17information submitted is. to the best of my keowledge and betiel. true. accurate.

and complete.

I am SIGNATU OF PRINCIPLE Plant Manager aware that there are signWiranm penalties for submitting false the possitiiy of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRKn-D fine and imprisionment Ior knowing violations.

AUTHORIZED AGENT CODE ,COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through this outfall 7 of 29 days during the month.EPA Form 3320-1 (Rev 3/99) So PAGE 1 OF 2 PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 E01 0PERMIT NUMBER DISCHARGE NUMBERIMONITORING PERIODYEAR MONTH DAY YEAR I MONTH DAYFrom: 0 8 0 12 0 1 To:10 8 1 0 12 2 19OCR0501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 0011E)STORMWATER NO DISCHARGE NOTE: Read inst-udions efore completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF SMLAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPENICKEL, TOTAL SAMPLE 26) 19) 500(AS NI) MEASUREMENT 01067 1 0 0 PERMIT L___Y1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT LBS/DY 30 DAY AVG DAILY MAX MG/L DAILY GRABZINC, TOTAL SAMPLE 269 500(AS ZN) MEASUREMENT 19)01092 1 0 0 PERMIT LBS/DY -1.0 2.0 MG/L DALLY GRABEFFLUENT GROSS VALUE REQUIREMENT

-30 DAY AVG. DAILY MAX MLDLYROIL AND GREASE SAMPLEMELNDN .T.. (26) .-....<1.5 1.6 (19) 0 290 GRMEASUREMENT__________

03582 1 0 0 PERMIT LBSDY 15.0 20.0 GICE. GRABEFFLUENT GROSS VALUE REQUIREMENT

... .._LBS/_Y_30 DAY AVG. DAILY MAX MG_ L MONTHFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.134 0.677 03) ---- ---- -0 290 TM50050 1 0 0 PERMIT REPORT REPORT ___ TWICE/EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MGD ..MONTH TOTALIZ.SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT

"_'NAMEMTLE It Certify under penalty, of taw thaft tlis document anid ad] attachrments were prepared under my 01TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supervision in accordance with a system designed to assure that qualified personnel property gather and evalute the information submitted.

Based on my inquiy of the person or persons 815 406-3700Bradley Adams who manage the system, or those persons directly responsible tor gathering the information, the R5N7PE17nloaion submitted is. eo the best o my kowledge and belie tre. accurate.

and complete.

I amOF PRINCIPLE Placane penales for subting ealse infofation, cluding the of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTHTYPED OR PRINTE ine and _mpsionment for knowing violations.

AUTHORIZED AGENT CODE NUMBER YER MNTACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference ail attachments here)EPA Form 3320-1 (Rev 3199) SD PAGE 2 OF 20 PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR) OCR0501MAJORIL0048313 001 0 (SUBR 01)PERMIT NUMBER DISCHARGE NUMBER IF -FINALCOOUNG SYSTEM BLOWDOWNMONITORING PERIOD EFFLUENTYEAR MONTH DAY YEAR I MONTH I DAYFrom: 01 8 1 0 12 To: 01 8 10 121 2 1".. NO DISCHARGE

=- ..NOTE: Read instructions before comglefina this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPESAMPLEPH MEASUREMENT

..........-

8.72 8.95 ( 12) 0 240 GR00400 1 0 0 PERMIT " 6.0 9.0EFFLUENT GROSS VALUE REQUIREMENT

-MINIMUM MAXIMUMCOPPER, TOTAL SAMPLE 25) 19) 50(AS CU) MEASUREMENT

(__)_(19)_500 01042 1 0 0 PERMIT LBSIDY 0.071 MG/L WEEKLY GRABEFFLUENT GROSS VALUE REQUIREMENT DAILY MAX MLWEL GAZINC. TOTAL SAMPLEZIN..OTL.AMLE(26)

-- ---0.086 (19) 0 240 GR(AS ZN) MEASUREMENT

26) 0__10 24_01092 1 0 0 PERMIT 1.0EFFLUENT GROSS VALUE REQUIREMENT

-LBS/DY -DAILY MAX MG/L WEEKLY GRABOXIDANTS.

TOTAL SAMPLE 26) (19) S00RESIDUAL MEASUREMENT (26)__19)_

_0034044 1 0 0 PERMIT -LBS/DY 005EFFLUENT GROSS VALUE REQUIREMENT DAILY MAX ML .WEY RFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 18.76 2380 03) 0 135 CN50050 1 0 0 PERMIT REPORT REPORT MGD CONTINEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX -DAILYCHLORINE.

TOTAL SAMPLERESIDUAL MEASUREMENT (26) 0.04 0.09 (19) 0 240 GR50060 1 0 0 PERMIT .-BS/DY 0.2 0.5EFFLUENT GROSS VALUE REQUIREMENT

___"__ 30 DAY AVG DAILY MAX MG/L WEEKLY..

.GRABHYDRAZINE SAMPLEMEASUREMENT (26) ..... (19) 50081313 1 0 0 PERMIT -LD 0.031 :DAHEFFLUENT GROSS VALUE REQUIREMENT DAILY MAX DISCHARGING NMrTE I cattil unlder peaf aty of law that this document and an attachments were prepared under my z 7 ./ TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supervison in accordance with a system designed to assure that qualified personnel Iproperty gather and evalute the intormation subtrted.

Based e my inogery o0 the person or pemons 815 406-3700Bradley Adams who manage the system. or those persons directly responsibte for gathemg the inforalioei, the 08 03 17information submitted is. to Mhe best of my knowldedge aed belief. true. accurate,.

and complete.

lamn SIGNATA~RE OF PRINCIPLE-Plant Manager aware that there are significant penalties lot submitting false inforrmation, inckjdilg the possibfity of EXECUTIVE OFFICER OR ARIEA NUMBER YEAR MONTH DAYTIME 00 tRiNED ine and impnsionment for knowing vioiations.

AUTHORIZED AGENT NOO U YEAR MONT DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments heli)Per Special Condition 4C., the maximum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 1 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 February 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)02/02/0802/09/0802/16/0802/23/0812012012012068.968.773.567.1Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharge to the Cooling System Blowdown during themonth of February 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byr-.ch\byrondb\clerk\Month~yDMR\attach0 I \Feb 08 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 February 2008COMMENTS:

I. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 29 of 29 days.k:byr...ch\byrondb\clerk\MonthlyDMR'atlachO I\Feb 08 PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACIUTY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 002 0PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIODYEAR IMONTH DAY I YEAR MONTH DAYFrom: 01810 2 0 1 ITo: 0 8 0I 2 2 9OCRO501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

-NO DISCHARGE NOTE: Read instrctions fore completino this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISPH SAMPLE --- -(12)MEASUREMENT 00400 1 0 0 PERMIT 6.0 9.0 SEEEFFLUENT GROSS VALUE REQUIREMENT

.... .. MINIMUM MAXIMUM PERMI GRABSOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT 00530 1 0 0 PERMIT 15.0 30.0 SEEoo~ EMTLBS/DY 30DA/AGLAIYGAXA___

EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX PERMITCHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT 01032 1 0 0 PERMIT 0.1 0.2EFFLUENT GROSS VALUE REQUIREMENT

______ 30 DAY AVG DAILY MAX MG/L DAILY GRABCHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT 19)01034 1 0 0 PERMIT LBS/iDY 1.0 2.0 DEFFLUENT GROSS VALUE REQUIREMENT 30-DAY AVG DAILY MAX MG/L DAILY GRABCOPPER, TOTAL SAMPLE(AS CU) MEASUREMENT (26) (19)01042 1 0 0 PERMIT 0.5 1.0EFFLUENT GROSS VALUE REQUIREMENT

___LD

30 DAY AVG DAILYMAX MG/L DAILY GRABIRON, TOTAL SAMPLE(AS FE) MEASUREMENT 19)01045 1 00 0SPERMITD

-1.0 10EFFLUENT GROSS VALUE REQUIREMENT

_--___LBS__Y 30 DAY AVG DAILY MAX MG/L DAILY GRABLEAD, TOTAL SAMPLE(AS PB) MEASUREMENT 02 (101051 1 0 0 PERMIT .. ..D 0.2 0.4EFFLUENT GROSS VALUE REQUIREMENT LBSIDY 30 DAY AVG DAILY MAX MG/L DAILY GRABkAMEMTLE I cerifly under Penalty of law than this document and all allachments were prepared under myPRdNCIPAL EXECUTIVE OFFICER diection or supervision in accordance with a system designed to assure that qualified peronne TLPproperty gather and evalute the information submitted.

Based on my inquiry of the person or persons 8Bradley Adams who manage the system, or those persons directly responsible for gathering the information, the 815 406-3700 08 03 17inlomation submitted is. to the best of my knowledge and befief, true. accurate, and comptete.

lam SIGNATURE OF PRINCIPLE Plant Manager aware that there are significant for submhti false including the possibity Of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYlweo OR etIrED fe and knoprisionment for knowing viotions.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building waslewater was discharged to the Stormwater Runoff Basin during the month.2. This discharge point was not used this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1,F2 PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, II 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 1002 0PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIODOCRO501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER I YEAR I MONTH I DAY I I YEAR I MONTH I DAY Io10 1 8 1 01[2101 1 To1 0 8 0 2 1 2 19 "NODSC9AGE

EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

(Minutes)

U-i U-2 U-I U-202/01/08 20 20 02/08/08 50 2202/02/08 18 18 02/09/08 50 5502/03/08 18 17 02/10/08 20 2002/04/08 20 2002/05/08 20 2002/06/08 20 2002/07/08 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 02/04/08Time: 14:07Analyzed by: D.B.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.50 -Izzzr0.38 -~ ~ ~0.46 -0.44 -0.420.40-0.380.360.340.320.30 -0.28E= 0.26& 0.24-0.22 -0.200.18 -0.16 -----------------------

---- * --0.140.120.10 [0.020.000255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-_I U-202/11/08 15 2202/12/08 20 2002113/08 20 2002/14/08 20 2002/15/08 20 2002/16/08 20 2002/17/08 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 02/12/08Time: 12:50Analyzed by: M. P.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.50-0.480.46--0.44--0.420.40--0.38-0.36 ---0.340.32 --0.30--0.28 -E 0.26--- -c. 0.24-CL0.22-0.200.18 -0.16--0.14 --0.12 0- -I i0.08 ---i L0.06-0.04 __ _ ..0.002 .,0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-1 U-202/18/08 20 2002/19108 20 2002/20/08 20 2002/21/08 20 2002/22/08 20 2002/23/08 20 2002/24/08 20 20==== --- ---- ---------

HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 02/20/08Time: 09:51Analyzed by: S.C.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26IL 0.240.220.200.180.160.140.120.100.080.060.040.020.00025 50 75 100 125 150Minutes EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-_ .V-202/25/08 20 2002/26/08 20 2002/27/08 20 2102/28/08 20 2002/29/08 18 30HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 02/26/08Time: 08:25Analyzed by: M. K.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mgfL. Allvalues less than this limit are reported for information only.0.5010.48-1---

0.46 -- -0.44 , 10.42 ---t0.40--0.38l0.36 -0.34-0.32-0.30 10.28 -E 0.26 1=.0.24-0.22-0.200.180.16--0.14 -10.12 --0.100.0810.06- -.0.04 1 I0.02 i0.00------------

0255075Minutes100125150

Exekn5.Exelon Generation

Company, LIC wwwexeloncorp.corn N u clearByron Station4450 North German Church RoadByron, IL 61010-9794 April 18, 2008LTR: BYRON 2008-0037 File: 2.09.0411 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit NumberIL0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report for* Byron Station, Units 1 and 2. This report covers the period of March 1, 2008 through March 31,2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley J. AdamsPlant ManagerByron Nuclear Generating StationBJNZCAttachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron0 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDESDISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 dPERMIT NUMBER[ _ A01 0DISCHARGE NUMBER)OCRO501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT.". NO DISCHARGE

""I 'MONITORING PERIODIYEAR I MONTH DAY I YEAR MONTH I DAYFrom:1 0 I 8 I 0 13 1 0 1 To:[1Y0I 8 1~ 0 1L Jl I I II m I I I I INOTE: Read ctions before completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO FREQUENCY SAMPLEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS. TOTAL SAMPLE 26) 1.3 1.3 19) 0 285 ECSUSPENDED MEASUREMENT 00530 1 0 0 7'RERMIT

"- " "3 ,'G".15.0 30.0 ONCE/LBSID --MCULCOUP-8 EFFLUENT GROSS VALUE REQUIREMENT L-""D',-.30 DAY"AVG DAILY MAX .. MONTH MCHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19) 50001032 1 0 0 ".r- .0.1 DAILY GRAB1 0 0) ... .-.-.LBS/DY " ; " -30DAY AVG6 'DAILY M AX ._,A Y *REFFLUENT GROSS VALUE REQUIREMENT

.; ' ;- ---- .CHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT 01034 1 00 " ".PERMIT

-,.-._L .. 1.0 20.EFFLUENT GROSS VALUE REQUIREMENT 4.- " ". ' ". /D -. 30 D .AL GCOPPER, TOTAL SAMPLE --(AS CU) MEASUREMENT (26) (19) 50001042 1 00 :PE.RMIT:.

-- --*- 0.5 -G1.0 ABEFFLUENT GROSS VALUE REQUIFIEMENT

.:.. __".._ .__ ". -30 DAYAVG DAILY MDYIRON. TOTAL SAMPLE )(19) 500(AS FE) MEASUREMENT 01048 1 0 0 PERMIT .10. -1.-1R:MIT" .- -LBS/DY .... .1.0 ML- DAILY. GRABEFFLUENT GROSS VALUE -REQUIREMENT

.-..... ._. 30DAYAVG DAILY-MAX

.ML ..LEAD. TOTAL SAMPLE ---(AS PB) MEASUREMENT 01051 1 0 0 PERMT .-LBS/DY ...4.

0 .2 -0.4 MG/L DALY GRABEFFLUENT GROSS VALUE -REQUIREMENT

-7__.-.-'

1.'". _-".. ..."30 DAY AVG DALY MAX..____.,..

-.__.. ._NICKEL, TOTAL SAMPLE(AS NI) MEASUREMENT

-- (26) ---- (19) 500EFFLUENT GROSS VALUE ,o-REQ 7777 30 DAY A- .. " "--MOMTLE I certify under penalty of law thathtis document and all allachmerts ware preepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supervision in accordance with a system designed to assure that qualified personnel propey gather and evatute the infonnabon submitted.

Based on my inqury of the person or persons '8G1A 086-3708Bradley J. Adams who manage the system, or those persons directly responsible r gaherig the informaf, the OFion,8NC0P3E 08 04t18informabon submitted is. to the best dt my tWwwledge and bele, true. accurate, and complete, aim ..OF PRINCIPLE Plant Manager aware thaI there ae significant penalties for sublntq talse information.

includng the possblty o EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PROTED fine and imprisi et for W g violations.

AUTHORIZED AGENT CO DE .. N M E YA M THDCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachrmneta here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed 26 of 31 days during this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 10.F 2 NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (OMR)PERMITTEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERAo o 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT... NO DISCHARGE E "I MONITORING PERIOD II YEAR I MONTH I DAY I I YEAR I MONTH I DAY Il .l .I .lI .l .l .IFrom: 0 1 8 0 1 3 1 0 1 11To:l 0 1 8 1 0 1 3 1 3 I 11NATE Rand in~tmntinn~

hafom rjnmnlatifln thin formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. F SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC, TOTAL SAMPLE 26) ( 19) 500(A S Z N ) M E A S U R E M E N T 12 60 21 90 5 0 0 ._ _G R A B01092 1 0 0 -,,PERMIT.

.LBSDY -A1. `.D -..0EFFLUENT GROSS VALUE -REQUIREMENT.

.-. Y .-30 DAY'AVG DALY MAX DLGFLOW, IN CONDUIT OR SAMPLE 0.35THRU TREATMENT PLANT MEASUREMENT 0.021 0181 (03) 0 1550060 1 0 0 .PERMIT,-

.REPORT REPORT. -EFFLUENT GROSS VALUE 'R REQUIREMENT.

30-DAYAVG DAILY MAX M" D DAILY CONTINSAMPLEMEASUREMENT PERMfT-REQUIREMENT

."SAMPLEMEASUREMENT

-PERMI- .- -. -.-.%-REQUIREMUN rNT ____________

"_SAMPLEMEASUREMENT

.-PERMIT '- .-_______________REQUIREMENT

__________

___ ,___ _________

SAMPLEMEASUREMENT

'REQUIREM ENT' ." .-!. _ -. _ ..... ._.-SAMPLEMEASUREMENT

.PERMIT -.~ .__ __ _ __ _ __ E E T, ;, :i:i::i : -'. , _ .I '., ,: :P NCALF..CLVE O CFFICR tunder penalty o law that the documentn l asteamdesignedts wear prepared unoer my A1 TELEPHONE DATEproperty gather and evalute the Inmtarmation submitted.

Based on my inquiry of the persono peonssBradley J. Adams who manage the system, or those persons directly reponsible for gathering the ainfimation, the8 08 04 18Iformation submitted is. to the best of my knoedpge and belief. true, accurate.

and compiete.

I am SIGNATUIOFPRINCIPLE lant Manager aware that there are significant wknlies for submitteg false information.

Including the poeaity d Fi EXEC --E OFFICER OR AREA NUMBER YEARTYWD OR po Inne and SAorlt tor knowing violations.

AUTHORIZED AGENT CODE NUMBER YEAR MONTH DACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3t99) SD PAGE 2OF2lWV NATIONAL POLLU t DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHAGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 I PERMIT NUMBERB0o 0DISCHARGE NUMBEROCR0501MAJOR(SUOR 01)F -FINALSTP EFFLUENT (FORMER 0015)EFFLUENT... NO DISCHARGE "JMONITORING PERIODYEAR 1 MONTHI DAY I I YEAR IMONTH I DAYFrom: I 0 1 8101310I 1 I To:l 0 I 8 I 0 I 3 I 3 I 1 1--NOTE: Read instructions eore completn tis iormQUANTITY OR LOADING QUANTITY OR CONCENTRATION No. FREQUENCY SAMPLEPARAMETER QUNEYOX___

____ __________

OF TPP M AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS800.-DAY<0.

0. (26) 3.0 119) 290 DC(20 DEG. C) MEASUREMENT 00310 1 0 0 PERMIT .142 28.5 .30.0 60.0 TWICEIEFFLUENT GROSS VALUE REQUIREMENT 30*DAYAVG

.DAILY.MAX:.

____Y_ 30 DY AVG L MAX MGML MONTHPHMEAME 7.16 7.39 (12) 0 290 GRr SU TWC/ GRABEFFLUENT GROSS VALUE REQU-IREMENT "MN.MU .MAXIMUM MONTHSOLIDS, TOTAL SAMPLE 0.12 0.18 26) 1.2 1.7 19) 0 290 DCSUSPENDED MEASUREMENT 00530 1 0 0 7 PERMIT 14.2 .20.5 .60.0 .TWICEf CEFFLUENT GROSS VALUE -REQUIREMENT

.30 DAYAVG DAILYMAX.

LBS/DY 30 DAY AVG .. DALY MAX MG/LMONTH FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.010 0.015 (03) 0 135 CN50050 1 0 0 " PERMIT- REPOT " ' REPORT MG " -" ...EFFLUENT GROSS VALUE REQUIREMENT.

'30:DAY-AVG

-. DILY MAX.':. D --... * .-* DLYNiSAMPLEMEASUREMENT

___________.EOUIREM.ENT.

q____ _____ _____SAMPLEMEASUREMENT

_____ _____ _____ _____..'. E.' B :. * -'..-. .: ..,' -.... .. .. .... * .-. ." ..... '. .,, ..--RE:UIREMEINT-

.!.. ..._*_... ..: .. .,_._ _.SAMPLEMEASUREMENT MREAUIREMENT F_

I cef*y under penalty ol law that this document and all attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIE OFFICER direction or supervision in accordance wkth a system designed to asaure that1 quidabed personnel

_____ ______prupely gatherand evaluteMe infonmaven s4,n, Ba~sedon my Inqudhproopm 81,5 406-3700Bradley J. Adams wo manage me system or those perons directy responsai tor ga8151g te 0e 08 04 18alorniatmon sukmitted is, to the best of my kowledge and befie. tte. accurate, and complete.

lam SIGNATU(WOF PRINCIPLE Plant Manager aware that there are signrifiant Deam tor suiil tabs 1fo1rma0 intclg the possdft of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYo& -tie and MWnisonment rfor k AUTHORIZED AGENT CODE MCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reftrence all attachments her*)1. Flow existed through this outlail 31 of 31 days duing the month.EPA Form 3320-1 (Rev 3/99) SD PAGE I OF I NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (OUR)OCRO501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60655FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERC01 0DISCHARGE NUMBER[ MONITORING PERIODYEAR MONTH DAY YEAR MONTH DAYFrom: 0 1 0 1 3 1 0 1 To:l 0 8 0 1 3 3 1 1MAJOR(SUBR 01)F -FINALWWTP (FORMER OD1C)EFFLUENT.NO DISCHARGE

"- *I I I , I I I II I I I I I INOTE: Read instructions before completin thislormQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EXOF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS, TOTAL SAMPLE 26) 2.2 5.0 19) 0 240 DCSUSPENDED MEASUREMENT (26) ..... 2._.0(9_20D 00530 1 00 PERMIT 'B 15.0 -30.0EFFLUENT GROSS VALUE REQUIREMENT

.._.... _ _'..-.-...

" _ -._ ." 30 DAY. AVG. DAILY MAX WEEKLY .: ., .CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19) 50001032 1 00 PERMI~T-02EFFRLUENT

.ROSS.ALUE

.. ", LBS/DY ..0.1 02 .MG/L "- DAILY' GRASEFFLUENT GROSS VALUE ýREQUIREMENT.

__---'____

30 DAY AVG. DAILY MAXCHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT 01034 1 0 0 .:PERM2T.EFFLUENT GROSS VALUE .REQUIR.EMENT

", MG/I' DAILY GRAB____________

REUIRMEN

_______ ____ _______ 30 DAY AVG. -DAILY MAXCOPPER, TOTAL SAMPLE(AS CU) MEASUREMENT

26) (19) 50001042 1 0 0 7 ' PERMIT ., "", -." *".A , -. -_7: :.. -, LBS/DY :' "".5 .-1,."

MG/L DAILY. -GRABEFFLUENT GROSS VALUE REQUIR'EMENT

.T -..-.LS/Y.. .---- '30DAY AVG .DAILY MAX MGI AIYGAIRON. TOTAL SAMPLE(AS FE) MEASUREMENT (26) -- (19) 50001045 1 0 0 "PERMIT -.: .. --- 1.0" .0EFFLUENT GROSS VALUE -REQUIREMENT.

--BS/DY ..30 DAY AVG DAILY MAX -MG/IL DAGLY .RALEAd, TOTAL SAMPLE(AS PB) MEASUREMENT (26) (19) 50001051 10 0 1,pE~Mfw

--' -LSD 0.2, 0.4 .EFFLUENT GROSS VALUE REQUIREMENT 30 O AY AVG, -DAILY MJAXDL .GANICKEL TOTAL SAMPLE(AS NI) MEASUREMENT (26) -- (19) 50001 6 10 PERMIT -.- -0.EFFLUENT GROSS VALUE REQUIREMENT

--BY .. ...... DAYAVG DAILY MAX MNAMETITLE cerLtfy under plnarty of law reat tis document and at attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICES diectton or supervislan a accordance with a system designed to assure Oa quasied personnel

,properly gather and evalutethe information aSu.itted Based an my mquiry thef parsm or persinsBradley J. Adams who manage the system, or totse persons directly responsible (or gaterig ta Fomntation, thea 0 04 Isinformation submintted

.s to the best of my k eow tedge and be lief, true, accurate, and complete.

Iam SIGNAT OF PRINCIPLE 18Plant Manager aware Oa there ar ssigniiarn penatties for submittitg lwse mlomla Incuding Metpssibof EXECdUTIVE OFFICER OR NUMBER YEAR MONTH DAY.. m OR;;;;;;;-

toe and lsloment wor nowing vitaons.

AUTHORIZED AGENT EAECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hare)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this outfall 20 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 20 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAMEJADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60655FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERC01A 0DISCHARGE NUMEOCRO501MAJOR(SUOR 01)F -FINALWWTP (FORMER 001C)EFFLUENT&. *NO DISCHARGE ED ...I MONITORING PERIODYEAR IMONTHI DAY YEAR IMONTH DAY !From:I 01 810131 0I T:1 0o:F 1 8 1013L L 3 ]q I I I I I II I I INOTE: Read instructions before comolelin-this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS Ex ANALYSISZINC, TOTAL SAMPLE 1 26) 19) 500(AS ZN) MEASUREMENT (2_)____-_(19)_5_0 01092 1 00 *. PERMIT * .--1.0 2.0EFFLUENT GROSS VALUE "REQUIR, ENIT ---.--- 30 DAY AVG. DAILY.MAX.

GI DALY GRA.OIL AND GREASE SASMLEN (26) <- 2.9 5.4 (19) 0 240 GRMEASUREMENT

____ ____ ____ ____ ____03582 1 00 PERMIT .Y .- 15.0. 20.0 MG/L WELY GRABEFFLUENT GROSS VALUE .REQUIREMENT-

....__._ -. .-, 30 DAY AVG. DAILY MAX ..... _*FLOW, IN CONDUIT OR SAMPLE 0.031 0.055 (03) 0 135 TMTHRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 .. PERMIT " -REPORT""

RER *MGD --------

-. DAILY TOTALIZ.EFFLUENT GROSS VALUE REQUIREMENT 301DAY-'AVG' DAILY MAXX-. _______,.

. " ,._,_ -SAMPLEMEASUREMENT

PERMIT-_REQUIREMENT-

,. , -___SAMPLEMEASUREMENT PERMITREQUIREMENT

-"." _ _ __. .._._--. _ ._ _ -.-SAMPLEMEASUREMENT REQUIREMENT

-.................

...-.......

-__._"._".

_" .__"" _ " " ",SAMPLEMEASUREMENT 1* H W -." ' ..... "-- ...-..'-________________REQUIREMENT

--.7-- '.' .C-. -___ -_____NAETE I cerifdy under penalty of law that this document and all attachmnentS were Prepared under mvy TELEPHONE DATEPRINCIPAL EXECUTIVE OFFCER drection or superee in accondance with a system rdesigned to assure that qualifd persoinel property gather and evalute the imtomiatian submitted.

Based oan my inquiry 0o the person or person 81 406-37Bradley J. Adams who manage, the system. orehoseper sn directly responsble ftr gatetng the infonaton.

the 08 04 18iWomation submitted is, to the best at my knowledge and beiief, true, accurate, and cartpelee.

Iamn S FRINCIPE__

Plant Manager aware that there are significant penalties for submittIng false infostan e posSa dt EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR POINTED and or MNtm V t vo, atiots. I AUTHORIZED AGENT cOD.E NUMBER I YEAR MONTDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60655FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERDOI 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 001D)EFFLUENT... NO DISCHARGE

-*MONITORING PERIODYEAR IMONTHI DAY I YEAR I MONTHI DAYFrom:1 0 1 8 1 0 13 1 0 I 11To:l 0I 181 0 1 3 13111I I I I I I INOTE: Read instructions before cornletin tis formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOUDS. TOTAL SAMPLESUSPENDED MEASUREMENT

26) CO.5 0.5 (19) 0 240 CP0)0530 1 0 a ..: PERMIT L BI.. ..:iS"' :.D-" 15,0" 30.0 ".15." ..:0AYV 30.0YMGI:

WEEKLY COMPOSEFFLUENT GROSS VALUE :REQUIREMENT

_._-'_-_._-_-

"__.__"__

"_._.___L

__DY_"_.

MG__ "E. -_____OIL AND GREASE SAUMPE 26) <1.8 3.4 (19) 0 240 GR03582 1 0 0 *RQPEQURMEN-

... --:. LBSDY -15.0. 2D.0 MGIL .EFFLUENT GROSS VALUE -AREQUIREMENT

.YAVG DALY MAX WE-KL GFLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.026 0.046 (03) ......_ 0 135 CN50050 1 0 0 -PERMIT .REPOR1T .REPORT, G ~-DAY- CNIEFFLUENT GROSS VALUE REQUIREMMT 30 DAY AVG' .,DAILY MAX-.._____._.

_.'__ '_ _ _._DALY _______SAMPLEMEASUREMENT_____

__________________________

REQUIREMENT'.

SAMPLEMEASUREMENT "EU dM T -I" '.MEASUREMENT

PERMIT-__ REQUIREMENT--

..-'- --." ,- * " "SAMPLEMEASUREMENT

-PERMITr.

-... ":R EOUIREME NT ---- 4 "__ _ _SAMPLEMEASUREMENT

______________________

NAUE/ITLE I ceruly under Penatly of law that is document and all attachments were prepared wnder myPRINCIPL EXECUiVE O dirctiR or suPerv~on in accordance whith a system designed to assure tat quamted pesaepCeOy gath and evalute the infomation submitted.

Based on my Inquiry of the pewwoi OT pons 815 406-3700Bradley J. Adams who manage the system, or those persons directly responsible for gathering the information, the j A FIP 4 1information submitted is, to the best of my knowledge and belef. true, accurate, and comtplete.

tam SIGNATUI*OF PRINCIPLE Plant Manager aware that there are significant penath for submitting false information, ricludng the possiblity of EXECUTIVE OFFICER OR A I BTno oR gPuisy i. ne and initrent for vioains.

AUTHORIZED AGENT COO NUMER YEAR MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)-1. Flow existed through ft outfall 15 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGEIOEimS!Wv 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenvitWe, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERE01 0DISCHARGE NUMBEROCR0501MAJOR(SUOR 01)F -FINALSTORMWATER (FORMER 001 E)STORMWATER

*NODISCHARGE E "MONITORING PERIODYEAR I MONTH I DAY I I YEAR I MONTH I DAY IFrom:l 01 01 3 01 .I jTo:1 01 8 1 01 1 134i1...i I I mPARAMETER QUANTITY OR LOADINGAVERAGEMAXIMUMUNITS--- 7 1PH00400 1 0 0EFFLUJENT GROSS VALUESAMPLEMEASUREMENT 4.-PERMIT.RE",Uf:IEMENT" SOLIDS. TOTAL SAMPLE 26)SUSPENDED MEASUREMENT 00530 1 0 0 .. PERIMIT -LBS/DYEFFLUENT GROSS VALUE RE-,IREMENTr

--.- ." .CHROMIUM, HEXAVALENT SAMPLE (26)(AS CR) MEASUREMENT

_---_(2_)

01032 1 00 .-PERMIT LBS/DYEFFLUENT GROSS VALUE REQUIREMENT

-,. .*CHROMIUM, TOTAL SAMPLE --- 2(AS CR) MEASUREMENT 01034 1 0 0 PERMITEFFLUENT GROSS VALUE REQUIRMENT

_ _____-.COPPER, TOTAL SAMPLE(AS CU) MEASUREMENT

.... (26)01042 1 0 0 -- --. L". -'EFFLUENT GROSS VALUE REQUIREMENT"

".-- -.IRON TOTAL SAMPLE -(AS FE) MEASUREMENT (26)01045 1 0 0 .PERMIT -LBS/DY :-":EFFLUENT GROSS VALUE :REQUIREMENT

-.. ---_ --LEAD, TOTAL SAMPLE(AS PB) MEASUREMENT (26)01051 1 0 0 PERMIT :. LB"77-EFFLUENT GROSS VALUE REUIREMENT-

"" --LS/DY ., .. -.NAUE~fl"TLE PRINCIPAL EXECUTIVE OFFICERBradley J. AdamsPlant Manager-MED 01 PAWnnEDI ceeay under penalty of law thai Utis doojmem and al attachmens were prepared under mydirectio or supemionn m acomldance with a sytem designed to assae that quasied pesonnelWoperty gather and evasre the Information submitted.

Based an my Irnquiry t the person or personsWh0o manag the system, or thQse perMons d&"l respoWnse fOr gathering the ionfunaon.

theinfomation submtted

m. to the best of my knoutedge and beget. tum, and co=nplete, I amaware that there aem s hdraat ean s tor submtting false v ,ti at. wcihxdr 9 pmoeky adrtie and nprtsbonmment for Knolng violaions.

IICOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through this outfall 12of 31 days during the month.EPA Form 3320-1 (Rev 3/99) So PAGE I OF 21 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMITrEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60655FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010.11004613PERMIT NUMBER :7E01 0DISCHARGE NUMBERMONITORING PERIODYEAR MONTHI DAY YEAR I MONTH J DAYMAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001 E)STORMWATER NODISCHARGE

...From:1 0 I 8 I 0 I3 1 0 1 11 To:l 0 1 I 0 1 3 1 3 1 1 1s ,.

i l I I lI ......NOTE: Read instFctions efore competing this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISNICKEL, TOTAL SAMPLE(AS NI) MEASUREMENT (19) 5001.0 2.0DAL 'GS01067 1 0 0 -=&D 30 DAY' AVG DAIL "A " .. .0'EFFLUENT GROSS VALUE REQUIREMENT-

__- _____ 30 DAY AVG DAILY MAX MG/I -DAILY GRABZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT

_(26)_(19) 50001092 1 0 0 -.PERMIT ' -2 1.0 .D2.0 "EFFLUENT GROSS VALUE REQUIREMENT.

-LBS/DY ..30 DAY AVG DAILY MAX MG/L DAILY GRB.OIL ND GEASESAMPLE OIL AND GREASE MAEME (26) 01.7 1.9 (19) 0 290 GR03582 1 0 0 PERMIT-.

-15.0 20.0 GTWICEB.EFFLUENT GROSS VALUE REQUIREMENT

-LBS/DY .* 30DAY AVG DAILYAX MG/M GRATXFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0R26R 03*--250050 1 0 0 .. PERMIT. REPORT REPORT .C TAEFFLUENT GROSS VALUE REQUIREMENT 3DAYAVG DAILY.MAX MGD -MONTHSAMPLEMEASUREMENT

'PERMIT -..REQUIREMENT

' " " "" "- ""SAMPLEMEASUREMENT PERMIT"'R.P, EQUIREMENT,-

--" *SAMPLEMEASUREMENT R.EUREME1T 7NA~TE I catitiy under penalty of law that thu documnent and all attachtimefts were prepared under liy .TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direchtio or suoemeam in accordance wit a system designed to assure Mat qualified personnel

/properly gather and evaluta the informataio submitted.

Baed on my, inquiry od the person or persons 815 1 40&37003 8 0Bradley J. Adams who manage thW Ss~ttem.

or tosea persions directly resonimble for gathening fth information.

the -~--------

80intonnation submitted is, to fth best of my knowledge and befief. true. accurate.

and complete.

I am SIGNATV OF PRINCIPLE

______Plant Manager aware Mtha thee are significant penalties for submitting false informiation.

including the possbit of EXECUTIVE OFFICER OR AR UMEEYAAMNH ATYIDOR PRCITED fnan mrsomnfoknwgviltn.AUTHORIZED AGENT CODE NUMBER YEAR__ MONTH__ACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 319) SD PAGE 2OF 20a 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITFEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenvWle.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 610101L0048313 PERMIT NUMBER[ 001 01 DISCHARGE NUMBERMONITORING PERIODYEAR I MONTh DAY I L YEAR I MONTH I DAYOCRO501MAJOR(SUBR 01)F- FINALCOOLING SYSTEM BLOWDOWNEFFLUENT.NO DISCHARGE From:I01 81013 1 0o l1 1To: o 0 8 I 0o 13 1 3 1 1 1NOTE: Read instructions before comoIetin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISSAMPLEPH MEASUREMENT

-6.62 8.84 (12) 0 240 GR00400 1 0 0 .. -PERMIT.

..-.'6.0 -".0 -U W GREFFLUENT GROSS VALUE :t-REOU.IEMENT4'

-MINIMUM .MAXIMUM '. W K GRASCOPPER. TOTAL SAMPLE(AS CU) MEASUREMENT (2_) (19) 50001042 1 0 0 -"P-ERMIT:

-. .. LBSDY -0.071 MLWEEFFLUENT GROSS VALUE REQUIREMENT

-. DALY MAX MG/L -'L GRASZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT

2) 0.131 (19) 240 GR01092 1 0 0 ,-..:-`PERMlT

-1.0EFFLUENT GROSS VALUE REQUIREMENT"

-" LBS/ DY -. .V MG/L WEEK YOXIDANTS, TOTAL SAMPLE 26) 19) 5RESIDUAL MEASUREMENT 34044 1 0 0 "-PERMT--

-.. -. --LBS/DY --'- -.0.05EFFLUENT GROSS VALUE REQUIREMENT

--- -.-- .. DAJLYMAX MG/L ."WFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 18.57 28.30 (03) -- 0 135 CN50060 1 0 0 .PERMIT -REPORT -REPORTEFFLUENT GROSS VALUE .RIE IREMENT 30"DAYAVG

.AILY:MAX

" MGD -DAILY. CONTINCHLORINE.

TOTAL SAMPLE (26RESIDUAL MEASUREMENT

26) 0.09 0.32 (19) 0 240 GRSMLBS/DY 0MG/L WEEKLY GRAEFFLUENT GROSS VALUE REQUIREMENT..2

.-. _. _.._ LBS_)Y .. 30DAY AVG. -.DAij.Y.MAX L .. iHYDRAZINE SAMPLEMEASUREMENT 19)81313 1 0 0 -".P-RMIr-"'

." ... "" '- .. L/D --: 0031 -, DAILY WHENEFFLUENT GROSS VALUE :`REQUIREMENT

....'- 7 .Y.. DALY.MAX:

MG/L DISCHARGING

.PRNPAL TVE I 0011 under pin Il-y1 law t t"is document and all attactiments wer prepared under my ,PAINCIPAL EXECUTIVE OFFICER dwco or supen~o Lq acodac wit a syte dete to asur Ma esne TELEPHONE DATEBradley J. Ad PP atinllh and evakittote Uonvitebon submitted.

eased on my kl*Mal di tie peso or persons 815 406-3700Bradley J. Adams wh~o manage ste sm or those persons directly responsible for gathering tet mormation.

m 08 04informatlon suirntted is. to the best of my Inowledge and bdeW, true. accurate, and comiplete.

lam SIGNATUF90F PRINCIPLE Plant Manager aarew that there are sunificant penaties for submtM tase vamonaton.

vidingw possW d EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTHTYPED OR PR,, nt rm and mp onme kntor n vl, ons.a AUTHORIZED AGENT cOD B YEAR M DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)Per Special Condition 4C.. the madimum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3/99) SD PAGElOFI NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER002 0DISCHARGE NUMBEROCR0501MAJOR(SUOR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

".. NOOISCHARGE

°MONITORING PERIODYEAR I MONTH I DAY I YEAR MONTH I DAYFrom:I 01810 3 0 I1 I TO:I 0 I 8 I 0 I 31 3 I1NOTE: Read instrictions; before comoletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EXOF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISSAMPLEPH MEASUREMENT

.(12)EFFLUENT GROSS VALUE REQUIREMENT

-.- .6.0" .- -.9.0 SEEGRAS0040.10MINIMUM

.MAXIMUM.

SU PERMIT ..SOLIDS. TOTAL SAMPLE 26)SUSPENDED MEASUREMENT (26)_(19) 00530 1 0 0 .:PERMIT

.15.0 30.0 SEEEFFLUENT GROSS VALUE REQUIREMENT.

30 DAY AVG DAILY MAX M/RMGACHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT

26) 19)01032 1 00 .PERMIT";

-' -00."EFFLUENT GROSS VALUE REQUIREMENT.

30 DAYAVG -DAILY MAX D0.1GRABCHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT (26) (19)01034 1 0 0 -PERMrT""-

-. .-.02EFL EN RO SV LUE REOUIRE EN .'; .' -"' .:- .... LBESIDY DAILY G"RAB.20EFFLUENT GROSS VALUE -L30D DAYAVG DAILY MAX. MG/L. DAILY GRABCOPPER. TOTAL SAMPLE(AS CU) MEASUREMENT (26) (19)01042 10 01--. ..... -0 0 PE 0.5 .1.EFFLUENT GROSS VALUE REQUIREMENT

..P.. ..BAY AVG DAILY MAX M .DAILY " RA-IRON. TOTAL SAMPLE(AS FE) MEASUREMENT (26)__19) 0 1.0 1.001045 1 0 0 ".PEMIT"..-

LBS/DY 30DAYAVG DAILY MAX MG/L DALY -EFFLUENT GROSS VALUE I.REQUIREMENT

..__--.__ "A..VG'"_.._-___""___

_-._.__ :GR .LEAD. TOTAL SAMPLE26) 19)(AS PS) MEASUREMENT 01051 1 00 P F-"-ERMT-;"S.Y.0.2

-" "EFFLUENT GROSS VALUE -REQUIREMENT

-..": _ LBS/DY 0 ."- D 02; -L " 'V MG/. DAILY -GNAME/TITLE I certly under penalty al aoalft doc:unment and as altachmiel were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER directin or supert imn aixoa ance witt a system designed to assure that qualifed personnel TE Nperly gamer and Ovalute the minfarmann submitted Based on my inquy of the personorpeios of5 "manBradley J. Adams who manage the system, or tsea persons direcly responrsbe for the itormaIont 815 406e3700information submitted is. to the best of my knowtedge and belie,, trum accurate, and cormpete.

Iam F PRINCIPLE Plant Manager aware that there are sgicant penafties for submitn false intomitaon inlding the possibey of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYeOR W and inaprstorment for knao, violations.

I AUTHORIZED AGENT CODE NUMBER YCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2- This discharge point was nol used this month.EPA Form 3320-1 (Rev 3/99) So PAGE 1 OF 210 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDESDISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvitle, H 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERSo002 0DISCHARGE NUMBEROCR0501MAJOR(GUSR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

'"NODISCHARGE IEJ"MONITORING PERIODYEAR MONTHI DAY I YEAR MONTH I DAYFrom:I 0 1 8 I8 03 FO 0 1 To:j 0 1 0~3 1 3 1i 1I I I m m I INOTE: Read instructions before completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISNICKEL, TOTAL SAMPLE 26_9(AS NI) MEASUREMENT (26) (19)01067 1 00 :.PERMIT--

" 10 -A...." " --

IBS/DY .'-"3.A V ' "DAL .A,, " MG/L ..DAILY. "OFR BEFFLUENT GROSS VALUE 3'0REQUIREMENT

" -.DAA M DALY ."RABZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19)01092 1 0 0 -PERMIT ---DAILY "GRAB1.EFFLUENT GROSS VALUE REQUIREMENT.

-,. ..". .30 DAY AVG DALY'MA MYSAMPLEOIL AND GREASE MEASUREMENT (26) (19)03582 1 0 0 <. PERMT -.5. 2. TWICE/ GA::.ERIT...t;..

iLBS/DY

.. .MG1L -.ONABEFFLUENT GROSS VALUE REQUIREMENT

.-L S D .30 DAY AVG. DAILY MAX MONTH ' -FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT (0_)_.........

..50050 1 0 0 PERMIT'.

REiORT':---

MEPORT---

TWICE/EFFLUENT GROSS VALUE i REQUIREMENT-7.30DAY.-AVG:-

DALY MAX MD ...._... _ """" _""'" MONTH "___A__SAMPLEMEASUREMENT R EQ U IR EM EN T ....: ...- , _ _.. , _.. ., ....." " ..._ _,._- -_ "_ -SAMPLEMEASUREMENT PERMIT_...

REQUIREMENT;.

-" ._ --. ..._ ...__ .- _ "SAMPLEMEASUREMENT P ERMIT" -' -"- "-REQUIREMENT-

, -- --, -" -

I centy unser penalty of taw ftat this document and all andnents weprepared under my TELEPHONE DATEPRINCIPAL EXX CUTIVE OFFICER drc tion o r su* In a orance w ith a sys tm des ve to ass ue a m quaTELEed PH ONnlygatler and evale in ommsuamted.

Based an myi Inquty t m 406-3700Bradley J. Adams wno manage me system.o atoce persons drecy responsilef for pfiga Me minformation.

th 1/ , PR 08 04 18mformaton subm:11e is, to the best of my knowledge and belief. hue accuate.

and complete.

,Iam SIGNA OF PRINCIPLE_

_Plant Manager aware th there are saisificant penales for suilaing false normatiorn, uding the pbkty at EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYO PRO nR fine and oitrsionment for knowing violtions.

AUTHORNZEDUAGEN R YE R'sI I~I~ AUTHORIZED AGENT CD ___ ____COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all atlachmenta here)EPA Form 3320-1 (Rev 3/99) So PAGE 2 OF 2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 March 2008BLOWDOWN TEMPERATURE MONITORING:

0Date03/01/0803/08/0803/15/0803/22/0803/30/08Calculated MaximumAllowable BlowdownTemp. (Degrees F)120120120Maximum ActualBlowdown Temp.(Degrees F)68.265.065.163.412012069.7Note: Station procedures derive the Calculated Maximmn Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharge to the Cooling System Blowdown during themonth of March 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byrý-ch~byrondb~cledc\MonthlyDMR~attach0l'tMar 08 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 March 2008COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.k:byrý_ch\byrondb~clcu1k\MonthlyDMR~attacho I War 08 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosini, Time Date Dosing Time(Minutes)

(Minutes)

U- I U-2 U-I U-203/01/08 17 20 03/08/08 22 2403/02/08 19 19 03/09/08 25 2503/03/08 25 2503/04/08 25 2503/05/08 25 2503/06/08 25 2503/07/08 26 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 03/04/08Time: 10:40Analyzed by: D.C.A.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.480.440.420.400.380.360.340.320.300.28E 0.26CL 0.240.220.200.180.160.140.120.100.080.060.040.020.00r --~ ..4...... ii--'-- --v __ __--J-~-.- ----I ----~-~- ----.- _ _-~zziz--~---t

I I I -.-j-KF- -T} TK1J tz:z~zz -ciiFH7ii

-~ .L -___ I ~ -~_____ I......1Z......~I.I I -~ ___ ____ I .1-I-i-~1 --~-------------

--1 ~ifzzzI_L_ IIjZ1ZIZZIZZZ:ZZ~ZZ7~ThT

-IF---~--~~~ ----i-V-.- -0255075Minutes100125 EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-1, U-203/10/08 25 2503/11108 25 2503/12/08 25 2503/13/08 25 2503/14/08 26 2403/15/08 23 2503/16/08 19 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 03/10/08Time: 10:33Analyzed by: D. L.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.286 0.26O 0.240.220.200.180.160.140.120.100.080.060.040.02@ 000ZiZ.I~] ~ I ____ ___ 1~i~ ~ I I f-j-I-_ _ i'll L..J-~ I-f-il'.--.-

-__ I ----i-f Iii Ii-__ ___ I -~-~-1~1~~ 1~1~1----------------.

If IZI~ZI I---------------------.---

H Vi~~Z.~~[ZLZiZ..ZE 1 -Ii I I I ii'T ~ I I I .- -i-~-~ I ii I_ _~ I __ __1Th __tzIz1~m~1~ -~ ___ ___II------------------------------------------'-I-I --.- ___~------------------I

_ _.L......]~1i

-I f-I.-0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-_I U,-203/17/08 30 3003/18/08 30 3003/19/08 26 2603/20/08 30 3003/21/08 30 3003/22/08 30 3003/23/08 30 30HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 03/17/08Time: 10:49Analyzed by: D.C.A.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00~'4VVk~ K' -f-ilzH~ .. fzzLz V~LI ..rH~ -_ _ I* ~ _{nI+/- _zzz~zzz1 IT I ~44Zi~~-~ ~ZZIZL ~K 4......~~z zzzEzLV.~.

nzzz~zz .L~ iL__ r --~ ---~ -~ -7Z~Z7I ZZIIZIZ.ZfZZZKIW~'

Iii *_ ----r -t-- -I ~025 .5075Minutes100125 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-203/24/08 25 2403/25/08 B IR15 2503/26/08 B IR15 2703127108 B IRIS 3003/28/08 BIRI5 3003/29/08 B IR15 3003/30/08 B IR15 30HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 03/24/08Time: 11:55Analyzed by: D.C.A.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.50-r

__ I i , I l i I0.46 -' .-1F10.44 -.0.42 -0.40 i* -[ -I ii0.38-----1..~~.

0.30 -- 1.I LK , _ I tir t0.36260.26-ft0.324-0.282 -'CLo .2o 41(Io.[,I -,0.20 , -0.18 , ,0.16- 0.0,11 :0.14- * --0.12 ------ I0I ' 00.04 I [ I0.04 -* 0:02 [ t..vL tl0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-__.l U-203/31/08 BIR15 264. 4.4 4.4. 1*HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 03/31/08Time: 12:16Analyzed by: D.C.A.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26CL 0.240.220.200.180.160.140.120.100.080.060.040.020.00n i -!1IKI*----

__,I jIii j IH~~+/-~ I tI +/-1 1 zi---l1 K-------..I- I ,__ '...... t... j-i , IL0255075Minutes100125150 Exelkn.Exelon Generation www.exeloncorp.com NuclearByron Generating Station4450 North German Church RoadByron, IL 61010-9794 Tel 815-234-5441 May 19, 2008LTR: BYRON 2008-0047 File: 2 41Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Elimination System (NPDES) Permit Number 1L0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report for ByronStation, Units 1 and 2. This report covers the period of April 1, 2008 through April 30, 2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley Ti AdamsPlant ManagerByron Nuclear Generation StationBJA\ZC\sdk Attachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron Station'A PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadNATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR) OCR0501MAJORIL0048313 A01 0 (SUBR 01)PERMIT NUMBER DISCHARGE NUMBER F -FINALDEMINERALIZER REGENERATE (001A)IMONITORING PERIOD EFFLUENTI YEAR MONTHI I I YEAR MONH DAYFrom:l 0 I 8 I 0 I 4 I 0 I 1 1 To:l 0 1 8 I 0 I 4 I 3 1 0 I* *

NO DISCHARGE E= ..I I .....Byron. IL 61010NOTE: Read instructions efore complefn this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS, TOTAL SAMPLE 2.11SUSPENDED MEASUREMENT

26) <1.3 <1.3 (19) 0 285 EC00530 1 0 0 .. B/Y~:-~-<~'-M/

~ rONCE/--~

EFFLUENT GROSS VALUE -.REQUIREMENT

_- ___; .. ._-"- Y ',,. "3" ' '- " -..DA.LY MAX L. --'-S MON-h CHROMIUM.

HEXAVALENT SAMPLE 2)1)5(AS CR) MEASUREMENT (26) _(19)01032 1 0 0 'PRi< .. ___ .'LSY §S M/. '.- 2AIY GABEFFLUENT GROSS VALUE .hQk IE1 EN :f,. -'.D- ---i""_........

-D:L'

-CHROMIUM.

TOTAL SAMPLE 26_9 500(AS CR) MEASUREMENT

26) (19)01034* --LBS/DY --~ -~ MG/I.

JIO G AEFFLUENT GROSS VALUE iliEbUiBEMEA4 P rv n.- ..3.A'V~"~Alk~A~

.-, ~COPPER, TOTAL SAMPLE 26) 19) 500(AS CU) MEASUREMENT (26) (19) 50001042 1 0 0 .-LBS/DY .- :AV--MG/.-.':

-"D,. ---: ;GRAB-EFFLUENT GROSS VALUE IRE. -_,EMENT'ý

-________

M_/L __._:..D

_ Y_-.___IRON, TOTAL SAMPLE 26) 19) So0(AS FE) MEASUREMENT (26)01045 1 0 0 E--.-.'.

a i ' ' ----- ...-' ' ., -0.-- -q --' LBS/DY --~-' .:t-M/.-

~ DiY- RBEFFLUENTGROSS VALUE QUIREMENT

° .. .SDDA-. AVG. .....Y"A-7 M_-LLEAD. TOTAL SAMPLE 2)X- 500(AS PB) MEASUREMENT (26) (19)01051 1 0 0 -iP.b"T-

.; .". -. -_ ...,: -M ._EFFLUENTGROSS VALUE 'REQUIREMENT-'

_- _." ____ _ _;__X= .. ..... .. .. .....................

NICKEL. TOTAL SAMPLE __) 19) So0(AS NI) MEASUREMENT (26)(01067 1 0 0 .----.-1 .2$ GI -GRAB' -';, -"

LIBS/DY

.; .._.-EFFLUENT GROSS VALUE RGJLEQUIRE EN : .--. .-_ _ _ ... -'.. -30DA.. VG... .AI LYMAX .j M -- .-"-NAME/TIT(E I certify wde penaty of law hat this document and at aftacinments were prepared under myPRINCIPAL EXECUTIVE OFFICER d or superviion ao wth a system desig to assure th at p TELEPHONE DATEraPedy gate. add evatethe information submitted.

Based on my inquiry of am person a 815 406-3700 08 05 19Bradley J. Adams who manage the system. or those peisons directly responsibr e for gathering the information.

Me '1i 1ie OF 08INCIP9informanion submitted is. to the best of my kIo-vedge and beief., tnJe. accurate, and complete-Iam SIGNATURE Plant Manager aware that there are significant Pelallies for suiilming false information.

including the posstility of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRINTED i and pisfliment for knwming vioations.

AUTHORIZED AGENT COD NUMBER YEA MONTHDAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed 29 of 30 days during this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadNATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PI004B313 A01 0PERMIT NUMBER- DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENTIIMONITORING PERIODYEAR MONTH DAY YEAR MONTH DAYFrom: 018 0 14 0 1 To: 0 8 01 4 3 10***NODISC4AIRGE

= ..Byron, IL 61010Byron,________

IL_____ _ _ 61010NOTE:

Read instructions before complefin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF YPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS TYPEZINC, TOTAL SAMPLE 26) 19) 500(AS ZN) MEASUREMENT (26)-(19)_500 01092 1 0 0 ".EFFLUENT GROSS VALUE ' /REQUIREENT

, , ".- .-...-....-

0_ ' "FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.035 0.134 03) 0 135 CN50050 1 00 0---:P..--

REPORT ...

-."-'DAILY-MAX EFFLUENT GROSS VALUE R:EQUIRE.MENT jDY: -.. MGD-....."..........._...........=

-_ ...A........T.N.-

SAMPLEMEASUREMENT PERMIT .SAMPLEMEASUREMENT

__REQUIR;EMENT

-.-.-- .--:- ___ _.___ _: _ -_._ .SAMPLEMEASUREMENT "RQU N" .- 11 .: '-_ --"'. _...- ."_:-*SAMPLEMEASUREMENT

ý7r -RMIT".______________'-REQUIREMENT-

-x 7-. r.-' -____SAMPLEMEASUREMENT R~ERMfl'.-

7_REQURMWENT--,

-- ,.. -.,- -, -. __.__.._____

NAMETITLE I certify under penalty of law that tis documant and all attachments were Prepared under my ,j"j TELEPHONE DATEPRINCIPAL EX(ECUTIVE OFFICER direcoon or supervision in accordance with~ a system designed to assure that qualified pesIe ___ ______ ____property gather and evalute the information submitted.

Based on my inquiry of the p~er=.o lros 1 630Bradley J. Adams who manage the system. or those persons directty responsible for gatlering the mnformrationt the h IGNA 00information submitted is, to the best of my kno,,edge and belief, true, accurate.

and complete.

I am SIGNATU OF PRINCIPLE Plant Manager awarethattherearsignificantpenaltesforsubmittingfalse fomiation inecluding the poss3ib*of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRINTED fne and mprisio for knog volao. AUTHORIZED AGENT CODE NUMBER _____ MONTDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF2 PERMIT`TEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT D*ISRGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 PERMIT NUMBERBol 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTP EFFLUENT (FORMER 001B)EFFLUENT*NODISCHARGE MONITORING PERIODI I MONTH I DAY I YEAR I MONTH I DAYFrom: 0181014 1 To:l 0 8 0 4131 0NOTE: Read instructions efore comoletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISBOD, 5-DAY SAMPLE(20 DEG. C) MEASUREMENT 0.66 0.78 (26) 8.7 9.4 (19) 0 290 DC00310 1 0 0 _ -......EFFLUENT GROSS VALUE 30'DAYAVG

.LBS/DY ý.D ._V?. ..,. .* -.. --1 MG/-A V.ONT. _._"-..PH SAMPLE ______MEAMULE 7.42 7.79 ( 12) 0 290 GRMEASUREMENT 00400 1 0 0 1.-2" .R.lT .., -. -.-.. ..- -'-600.

90*-P;.;-

...EFFLUENT GROSS VALUE R UIE NT .-. .... _-'--_ -INIMUM.SU

...GRABSOLIDS, TOTAL SAMPLESUSPENDED MSUREMENT 0.28 0.52 (26) c3.3 6.2 (19) 0 290 DC00530 1 0 0 Z5ý-P;ERMIT-.

-_14.2; -* LS/Y-285zFTICi~

EFFLUENT GROSS VALUE REIIEET--3 AAG --OIYA -" 0AYV--DAY4

____ MONTHM' '4--SUSENDD EASUREMENTI

-FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT 0.009 0.015 (03) 0 135 CN50050 1 0 0 '.-_PERMIT-,

t.-REPOR,.-

J.RE'ORT-'-

MGD 0-. ____A.- -. -:. --EFFLUENT GROSS VALUE -ROIREJ ET;- .-0 -. -__ " -_ -." -'. '.D Y LOT .SAMPLEMEASUREMENT

________________

REQUJIREMENT7, A~~- -~ -.'-., *-'~~ ~'SAMPLEMEASUREMENT

'RE U54MEN...

__ _ __ _ __ _ -_ REQU -.. .-.-'. _.__.___._-.

.-":,--. -.---., _-._,----. -.__ _ _-SAMPLEMEASUREMENT NAMErMlTE I canify under penalty of law that the docnment and all attachments were prepared wider my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER &arction or supervision in accordanice with a system designed to assure that qualifiedpesre____

-properly gather and evatute the information submitted.

Based on my inquiy of the eo or persons s 815 406-3700Bradley J. Adams who manage the system, or these persons duectly responsle for galtern t iformation the 0information submitted is. to the best of my knowledge and beief. true. accuate, and complete.

I am SIGNATURbF PRINCIPLE Plant Manager aware them are sagmftart penalties for submitting false information.u ucd the posty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTPiO oR PRINTED Lfe and tmipisionent for knowing violations.

AUTHORIZED AGENT CODE NUMBER YEAR MONTCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. Flow existed through this outfall 30 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE I OF i NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERCol 01 DISCHARGE NUMBERMONITORING PERIODYEAR IMONmh DAY I I YEAR I MONTH I DAYOCRO501MAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENT***NO DISCHARGE

-]From:I 0 1 81I01I410111 IToTI0 8[1 0141 31I0NOTE: Read instctions ore completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER E OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS. TOTAL SAMPLESUSPENDED MEASUREMENT (26) 3.1 7.3 (19) 0 240 DC00530 1 0 0 ., : .-,... LS/DY --MG/L .. -" " -'_____YG/ a-. ,WEEK'LY

-rCOMF24Z-EFFLUENT GROSS VALUE 7REQUIRMENT,'.I

.ý " .2 " i 301DA -A :" ..LY. "3 ........---

..__. "CHROMIUM, HEXAVALENT SAMPLE 19) 500(AS CR) MEASUREMENT (26) 901032 1 0 0 -- " ..=- LBS/. --.-O.i-.z.-0

... .. :- .....RAEFFLUENT GROSS VALUE REQUIREMENT-

.a L. -_,_VGCHROMIUM, TOTAL SAMPLE __26)_( 19) 500(AS CR) MEASUREMENT 01034 1 0 0 4L. .

-.........

LBS/D " -' '. 'i MG/ '~L 7-' GRABEFFLUENT GROSS VALUE -REQUIRE.ENT

..3

.......COPPER. TOTAL SAMPLE 26) 19) 500(AS CU) MEASUREMENT (2 (19)01042 1 0 0 " +m- '? I_-L6:.r

. -' ..... .....:002100 U LBS/DY -O.Li -'- -7 MG/L GRBEFFLUENT G RO SS VALUE REQU IREM ENT X-. -______-

-.....DAY: "G D L A ..D A" Y- -.IRON. TOTAL SAMPLE 26_9 500(AS FE) MEASUREMENT (26) (19)t-y -u-.' * .01045 1 0 0 ý'..G"-

-' .... "'.LBS/DY MGJjj -/L GA.EFFLUENT GROSS VALUE QU- -.. __ -___._. ... .30,_.__AY__

V G ._ -DAYýMAX.

.-., _ ..: .LEAD. TOTAL SAMPLE 26)19 500(AS PS) MEASUREMENT 19)01051 1 00 00204.PERMI

",--: -- LBSDY 02 -7 O:. --'-... ... ...

--.7, LamIy z : 7"+. -r-r.'a.+..A MG/L , .Fr"k+kDAILY

--i +:GR E -EFFLUENT GROSS VALUE :REQUIR,.ENT

.-.. -. -..... 'A t,.30lAY.VG DAI, ' MG/, 6"= -NICKEL. TOTAL SAMPLE 26) 19) 500(AS NI) MEASUREMENT

-26. (19) 50001067 1 0 0.. -----.-E" ..-EFFLUENT GROSS VALUE ". -. LBS/DY. -- --. ..... 0-.'-"'

.-; "LY..........

.,EUIEMN_

...'- -'________

_+ i 30DY V DoYMX'? .-V ' 'NJXEMTTLE I ceartiy unider penalty of law that thes documnert and atl attachments were pr epared under my .9 //ITELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supervision in accordance with a system designed to assure at qualfied personnel tpopery OarD and elet informatonAsuUtO Eased n my CnqOD of te person or perso8 08Bradley J. Adams who manag the system, or those persons directly responsible for gathenng the information, theinfomation submitted is, to the best of my knowledge and belief. tue, accurate.

and compltete amn SIGNATURE OF PRINCIPLE Plant Manager aware that there are sigqfant penalties for subittý false including the possblity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPE OR foe and imprisionment for knowng violations.

AUTHORIZED AGENT CODENME EA OT ACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this outfall 19 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 20 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERCol 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENT'

NO DISCHARGE

...IMONITORING PERIODYEAR MONTH DYEAR MONTH DAYFrom:'.0 1 8 0 1 4 1 0 1 1 I To:1 0 1 8 0 1 4 1 3 1 0NOTE: I(ead inst uctions telore comoletin fts formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISZINC, TOTAL SAMPLE 26) 19) 500(AS ZN) MEASUREMENT_

(26)_(19)50 01092 1 0 0 ':S't -2RMI ---EFFLUENT GROSS VALUE .-=QUIR-E L ...... t MG...- ALY.. ..- G -A .OIL AND GREASE ( 26) <2.6 4.8 (19) 0 240 GR03582 1 0 0 PERMN LBS/DY MGLW GAB-EFFLUENT GROSS VALUE DREQUIREMENT T.,- ..'30 'AYAVG-..

LSY',Y MA. MG'... " E2(LYFL,:

G-.B-FLOW, IN CONDUIT OR SAMPLE 0.03 0.05 03) 0 135 TMTHRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 -- W-. REPORT-I E- REPORT.-

D,-.TOTAL.-

EFFLUENT GROSS VALUE ""REQUIREEN.

-"' :YAVG' DAILY -AX MGD "-" ' .SAMPLEMEASUREMENT

.QUIREMENT......

...... , ... .- ____ -_ _ __"SAMPLEMEASUREMENT 2- 7E1IT ~'REQUIREMIENT.

---_-------SAMPLEMEASUREMENT

__________

____ ___SAMPLEMEASUREMENT

_______________

MEASUIREMENT-as -~.-NAEI'E I cesifiy under penalty of law uiat this document and asl attacmients were prepared under my TEEHNEDTPRINCIPAL EXECUTIVE OFFICER direction or m accordance with a system designed to assure that qualified personnel properly gather and evalute th informatow submitted.

Based on my inquiry of the peson or pe1sons54063700508051 Bradley J. Adams who manage the system, or those persons directly responsible for gathenng the information.

the 88 1 19information submited Is. to the best of my knatedge and beief. true. accurte and compttee Iain SIGNATURE OF PRINCIPLE

_Plant Manager awaethat there are significant penalties for subnltrg fase information.

the pssiby of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRINTED ___ _ne and imprisionment for knowing violations.

AUTH0 RIZED AGENT I OD ECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2.OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEIADDRESS NAME Exeton Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERr D01 0I DISCHARGE NUMBERMONITORING PERIODYEAR MONTH I DAY I YEAR MONTH I DAYOCRO501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 0010)EFFLUENTNO DISCHARGE From: 1 0 1 8 I 0 14 01 1 o 0 I TO 1 I 1810 1 4 I 3 1 0 1I I I I I i lNOU TE: R-eao insr cnS oefore cornmein this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER AVERAGE NO.IMUM SAMPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANLYIS TYPE>< ANALYSISSOLIDS, TOTAL SAMPLE 2.14SUSPENDED MEASUREMENT (26) <0.6 07 (19) 0 240 CP00530 1 00 0"PERM "-_ :>.-'V-.:50,-o

.30.0-,tv ___ __ .-MGL -WEEkLY--

CMpo-EFFLUENT GROSS VALUE EIQU.REMENT.,

-" ....30.YA'G-_"'DAILYMAX

-=OI N RAESAMPLE_______

OIL AND GREASE MEASUREMENT (26) <1.4 <1.4 (19) 0 240 GR03582 1 0 0 !-, E-PERMIT

-`ýtý `5. 0_ -_. ----' ' .EFFLUENT GROSS VALUE .-REQUIRurr

.-. -_ :1-.-- .--". ' MG/L -4'0-'A-Y-:" LYFLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0025 0.046 03) 0 150050 1 0 0 .PERMIT$--

REPORT-REP-ORT MGD CONT"NE0T. 0 DAYFLUENT GRS DAILY MAX.-.. ";"-"'"...-"

".U. -_"' -' "."" ..SAMPLEMEASUREMENT

__REQUIREMENT-'.7.-

: --- " ":,."- -"" _ _ _ " 1 -- "_' '7-"SAMPLEMEASUREMENT

-',E; ',. .RM-. -., .-', .-_ -. ..'. _,_._-'"'rREQUIREMENTýT-

.____ ..- ...- -. ~ -SAMPLEMEASUREMENT

_-R E Q U IR EM E NT .-. _- .. --._.-_. ..._._-._. , ,: ; ---- -, "-- 7_ _ _ _. "SAMPLEMEASUREMENT PRINCIPAL EXECUTIVE OFFICER dCirection or supeIPn in accordance with a system dDTned to assure M qualfied peronnelproperty gather and evalute the informaton submitted.

Based on my inquir of the person or pesons 815 406-3700 05 19Bradley J. Adams who manage the system, or those persons diectly responsible for gatnenng the iformation.

the _inhomato submitted is. to the best of my knowledge and belief, true, accurate, and complete.

lamn SIGNATU OFPRINCIPLE Plant Manager eawae that there are signiftcant pentaties for submitting false inflormation.

including the possibtay of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYrYPED OR tine aid impnsloiment for knowng vioaticns.

AUTHORIZED AGENT CODCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. Flow existed through this outfall 8 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE I OF 1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMT'rEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERF _ E01 0DISCHARGE NUMBERI MONITORING PERIODYEAR MONTH I DAY I YEAR MONTH I DAYMAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)

...NO DISCHARGE ElFrom:1 0 I 8 I 0 I4 1 0 11 To:l 0 1 8 1 0 1 4 1 3 1 0 1NOTE: Read instructons feore complet in s formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH SAMPLE 12)50MEASUREMENT (12) 50000400 1 0 0 --.SEE'.T- ..---- .... .. :t-:r,.-

.,.S. .EFFLUENT GROSS VALUE 2ROREMENT'V-

..-wue* 7:v_7!~"?

TTUSOLIDS, TOTAL SAMPLE 26) 19) 500SUSPENDED MEASUREMENT (26) (19) 50000530._ 1 0 v.,- --_.-,0030 0 ERIT ~LBS/DY '15 GRAB~EFFLUENT GROSS VALUE ,..RE.1.U.MAEIE-f-r .._. _ LS__ 30 DY! AVG', ..GL. , MG/LCHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19) 50001032 1 0 0 2-ERMI .7....EFFLUENT GROSS VALUE -EU MMT.LB:0.1

CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (26) (19) 50001034 1 0 0 ý:L5PERMm-,'

,- -- --- -,--. 0. .- O-_ +/-~ LBS/DY .-7-2 0~2 -o- .- l-~~REFFLUENT GROSS VALUE !fREQUIREMENT'ý.4

-._.3D.ADIYMX

--.. :COPPER. TOTAL SAMPLE 1 2)95(AS CU) MEASUREMENT (26) (19) 50001042 0 1 0 0 f;- LBS./:'DY MGI.L GRAB." ..

.:

..EFFLUENT GROSS VALUE --.REQUREMENT-LD

"' D o M"S ". oyw7x.. " -" -IRON, TOTAL SAMPLE 2)95(AS FE) MEASUREMENT (26) (19) 50001045 1 0 0 ...a-.PERM..

" ......'T MG.I.' .........

-DIY " REFFLUENT GROSS VALUE RCREQ.

D... ..Y M/L_ _ :a :-ý .,.-.LEAD, TOTAL SAMPLE 1 2)95(AS PB) MEASUREMENT (26) (19) 50001051 1 0 0 ~ B/Y~Z.~ i'~ O 4- GL ~ OLa;,KGRB EFFLUENT GROSS VALUE ,-EQUyREMENT-. -xi -- ______ -" '- .ý. 30OAY-AVG DALyMA. r1 M : -' -. a-.-.NAMErRYLE I cify under penalty of law thai this doourlent and al attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICIER direction or supervision in accordance with a system desge to assure tht qaldied personnel property geather ansanievao the pIerona subrittetl asepon myeinor, at of the persnon rpersons 81 4 -7Bradley J. Adams who manage the syst or hose pn diely responsible for 9. the 48miton, the 815 406-3700 08 05 19infonnation submitted Is. to the best of my knowledge and belef. rue. accurate, and complete.

I am SIGNATLnE OF PRINCIPLE

_Plant Manager aware that there are significant penalties for subntitng false infonration.

including the possibily of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPEDORPIED

fln foron owing AUTHORIZED AGENT CODE ICOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Storrnwater Runoff Basin during the month.2. There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through this outfall 9 of 30 days during the month.EPA Form 3320-1 (Rev 3&99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERE01 0DISCHARGE NUMBERi-- MONITORING PERIODI YEAR I MONTH I DAY I I YEAR IMONTH I DAYOCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORMWATER

"*** NO tSCKARGEi --- -i i lFrom ( 0 18 1 0 1 4 1 1 1ITo: o 8 0 4 3 0 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMIrTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER001 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALCOOLING SYSTEM BLOWDOWNEFFLUENTNODISCHARGE MONITORING PERIODYEAR MONTH DAY I YEAR MONTH I DAYFrom; 0 1 8 0 4 0 1 TO; 0 8 0 4 1 3 0NOTE: Read instructions efore completn ois foQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISSAMPLE_______

PH MEASUREMENT 8.64 8.79 ( 12) 0 240 GR00400 1 0 0 -zPERM lTW :` -6 0.- " ......EFFLUENT GROSS VALUE RIREMENT

,..

---"- .,,.

-,A.--COPPER, TOTAL SAMPLE 26) 0.011 19) 0 240 GR(AS CU) MEASUREMENT (26)01042 1 0 0 V' IT"F."7>'

.-_.... ......" " ........O.iT-.0-1

,? MG/L ." ...WEL , GAEFFLUENT GROSS VALUE .REOUIREMENd.~:*

.-b -LSDY.~--.

.ZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT (26) 0.117 19) 0 240 GR0102 10 0-~PRMI~

' -___ LBSIDY E- MG/I. Lj "..-WEEKLY--.

NABEFFLUENT GROSS VALUE :(:REQUIREMENT-.

, ."' -.'.'N17- '_" 1,_-DA. ..' L .-.. .. -_77--_OXIDANTS.

TOTAL SAMPLE 26) 19) 50RESIDUAL MEASUREMENT

26) (19) 5034044 1 0 0 n _PEMT__7L--

~~PERMIT.?

.. --~~ LBS/DY ~ __05 M/.VEKY 'RBEFFLUENT GROSS VALUE PC:EUI ,E .MG/L "-DLMX -'FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 17.14 2528 03)50050 1 0 0 -7": PER M 1T : "I "T D in..v. ' --ONINMGDEFFLUENT GROSS VALUE REQIIREME4NT

..'30DAYAVG..-:

DAYMAX --.." -..*-'.'.. .- ":-CHLORINE, TOTAL SAMPLERESIDUAL MEASUREMENT

( 26) 0.10 0.37 ( 19) 0 240 GR50060 1 0 0 -- ---.. -02 * .'-" °."EFFLUENT GROSS VALUE REQUIREM ..____. .--._ '-W EE:.- GR... .BSAMPLEHYDRAZINE MEASUREMENT (26) (19) 50081313 1 0 0 -;r"; MT ,. ': =-" " '-'" U j- LBS'DY ....0.. -"r -A ý -... .. .... ... ..... jv 4 -t. ' ....... ....DILYW H N1EFFLUENT GROSS VALUE

.., :..........

--.lS..H: :ING.:--

rPRINCPAL EXECUTIVE OFFICER direction or supervtsion in accordance with a system designed to assure that quaffied pemonnel TELEPHONE DATEproperly gathe and evalute the nformation submitted.

Based an my brqiry of the person or persons 815 406-3700Bradley J. Adams who manage the system, or those persons directly responsimle for aewing fdiemionnaftn.

8 08 05 19mfomiation submitted is. to the best of my knowtedge and beWif, true. accurate.

and complete.

lam OPlant Manager aware that there are sigrifcant penalties for false iionuon, inludig the posaibtity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRIN' .-fine and iwseonment for ow i vioations.

AUTHORIZED AGENT CODE NUMBER YEAR MONTDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)Per Special Condition 4C., the maximum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 1 PERMITnEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power SlationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 002 0PERMIT NUMBER DISCHARGE NUMBER[ MONITORING PERIODYEAR MONTH DAY YEAR MONTH DAYFrom: 0 8 0 1 4 0 1 To: 0 8 0 4 3 0OCR0501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

NODISCHARGE NOTE: Read instructions before comvletino this formA EQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEPH SAMPLE 12)MEASUREMENT 00400 1 0 0 SEE_EFFLUENT GROSS VALUE --'----.- -. --..........

-. SU -.' -GRASOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (26) (19)00530 1 0 0

.:.-PR I-:-.' .-

..... ....................

".............~.

00530 1 0 0 30- , .- 0-.* -L.BSI/DY

.. M-. -..'- *i' GRA -EFFLUENT GROSS VALUE .. REQUIEMENT

, ..... ..,...-.3.

DAyAVG M,...PERM-T

CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT 01032 1 0 0 :. --.-'PERMIT!;"-

.. --.-... .. ....;EFFLUENT GROSS VALUE -REQUIREMENT-

'DA .'.YLSJD

--. ...G.... --:DA1-Y'-.GRAS

-CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (26) (19)01034 1 0 0 -2 M-EFFLUENT GROSS VALUE IRE.,T0 D.AIL..COPPER, TOTAL SAMPLE2619 (AS CU) MEASUREMENT (26) (19)01042 1 0 0 -_-ERMATV,

--' .-' ...I. Y -,.5..-MGL

-'- ..- --A-EFFLUENT GROSS VALUE "--EQU[1.EMENTi

-- -,- _ 300AYAVG.i DALYMA r.- --.. .. :DAYIRON. TOTAL SAMPLE(AS FE) MEASUREMENT 01045 1 00 -0 PERMIT .. '-.- ,-A LBS/DY° -- .- ; 0 -DAILY-'.. ..EFFLUENT GROSS VALUE U T -Z...' .-. ...-.DYV A M,___ -- __- ___.LEAD, TOTAL SAMPLE 26_9(AS PB) MEASUREMENT (26) (19)01051 1 0 0 _- -ERMIT- -EFFLUENT GROSS VALUE .REQUIEMN OAAV* 7 ~ -BSD .EFLUNTGOS VLU

________ ..MG)L DIY7 GNAMErTLE I cenfy under penalty of law that this document and all attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER dection or supervision in accordaance with a system designed to assure that quafifed personnel property gather and evahue the kdonraton subnited.

Based on my inqmry of the person or persons8Bradley J. Adams who manage the system. or those persons dUectly responsible for gathering the amionallon.

the 815 40E-37 08 05 19information submitted is. to the best of my knowledge and belief, true, accurate.

and complete.

I am SIGNATU OF PRINCIPLE Plant Manager awae that there are signfiat penalties for submitting false information, incjdixng the possiblity of EXECUTIVE OFFICER OR R NUMBER YEAR MONTH DAYTYPED OR PINTED ie and imprisionment for knowin violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. This discharge point was not used this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWanrenville.

U 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL004D313 PERMIT NUMBER002 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

*

NO DISCHARGE

IMONITORING PERIODYEAR MONTH DAY I YEAR MONTH DAYFrom: 0 1 8 0 14 10 1 1 To: 0 8 0 14 1 3 1 0I I l I I l !! I ! I I I INOTE: Read instructions before comDietn" this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO FREQUENCY SAMPLEPARAMETER OF SAPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISNICKEL, TOTAL SAMPLE 26)19(AS NI) MEASUREMENT (26) (19)01067 1 0 0 2-PERMIT1 :.EFFLUENT GROSS VALUE --:REQUIEMEN'

" -

_-_______

.........

MG......-

DAILY -. ....-ZINC. TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19)01092 1 0 0 7TERUIT"+"

+. .. -- LBSiDY .. ---- -1... MGIL -. DI. Y-..GBEFFLUENT GROSS VALUE -.EQUIREMENT.

IAY'-'.2-.'+-

--. : A. _ _- sr,- .-, -00AYA.G'

-Y.. -- -.2 -.-, -_,_,OIL AND GREASE SAMPLE 26)MEASUREMENT (26) (19)03582 1 0 0 ... I!- R ---.; --". .. ' -200..G..

.0E F F L U E N T G R O S S V A L U E ýIE 'U R -.--, .3 0 A Y .A ,G D- -Y M X .-M O-.'. .-=: ..FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT (03)50050 1 0 0 REPO~RPRT~

" ~ MD ~ ~ 1ICiCTTL.

EFFLUENT GROSS VALUE TRQUIREMNT MG__ .., "" : ...TA- --_ ".....SAMPLEMEASUREMENT

..PERMIT~-

~ ..-. .SAMPLEMEASUREMENT

-PERMr-.*-

.- -, .4'REQUIREMENT-

.'.___________

______________

SAMPLEMEASUREMENT

,REQUIREMENT,.

4' +, __ _ .______ _ __ _PRNCIA )ECUTh~E Of n ridr enll of law that tfts document and all attachmernts were prepared Wide my 00,tTEEHNEDTPRINCIPAL Or<Cr-V OFFICER c POr sltp in accordance with a system designed to assure that qualified per-,oneELEPHONElDAT propely gather and evalu the infematton subnitmd.

saw on my nmiy of Ihe person n 815 o406-3700r8 Bradley J. Adams who maage the system. or those pat directly respo nsi h for gathel binfonn , eIGNA1 08 05 19information subntted is, to the best of my knowledge and belief. tre. accurate, and compete.

I SIGNATURE OF PRINCIPLEam Plant Manager aware that ewe are signcan penalties for submitting false infaninatim nidudirg the possiblity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYWPMrOR PRIrNrEo ie and upsisonment for knowing vons. AUTHORIZED AGENT CODE NUMBER YEAR MONTDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachmenta here)EPA Form 3320-1 (Rev 3199) SD PAGE 2 OF 2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 April 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)04/05/0804/12/0804/19/0804/26/0812012012012077.171.080.976.3Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of April 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byrých\byrondb\clerk\Mon~hlyDMR\auachO I AprI 08 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 April 2008COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 30 of 30 days.k:byrch\byrondb\clerk\MonztilyDMR~attachO I AprI 08 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

(Minu'tes) u- I U-2 1u U-204/01/08 0 30 04/08/08 30 3004/02/08 0 30 04/09/08 26 2404/03/08 0 30 04/10/08 30 3004/04/08 0 23 04/11/08 30 3004/05/08 0 23 04/12/08 28 2604/06/08 0 30 04/13/08 25 2504/07/08 0 25--------

HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 04/07/08Time: 11:25Analyzed by: D.C.A.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26CL 0.240.220.200.180.160.140.120.100.080.060.040.020.00, -I I ' IlI. tI I'__ I I I! I II I [ I .........

].... .___ _ _ _ I .i 1 { i ..,>_ _ JL I ~ ~0255075Minutes1001251-0 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-204/14/08 30 3004/15/08 31 3204/16/08 27 3004/17/08 28 2504/18/08 27 2804/19/08 30 2804/20/08 27 30HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 04/15/08Time: 11:46Analyzed by: D.B.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.oI r I .j0.50 i I0.436 I T j0.406 -I!0.380.34 1' -,0.320.30 L I I0.28 --I0.24 I-- I _ z0.22- 1I0.20 -- ___0.14 I I I0.120.140 -f I0.1 # 0.06 1 I I0.o 0 'K -1 1 : 1i10 .000255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-1 U-204/21/08 40 4004/22/08 40 4004/23/08 30 3504/24/08 25 3004/25/08 30 3504/26108 40 4004/27/08 40 40HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 04/22108Time: 11:42Analyzed by: T.M.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.EC.a-0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.000 25 50 75 100 125Minutes150e EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-204/28/08 40 4004/29/08 40 4004/30/08 40 43HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 04/28/08Time: 09:55Analyzed by: T.M.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.E0.a.0.500.480.460.440.420.400.380.360.340.320.300.280.220.200.180.160.140.120.100.080.060.040.020.00025 50 75 100 125Minutes150

Exelkn.Exelon Generation www.exeloncorp.com NuclearByron Generating Station4450 North German Church RoadByron, IL 61010-9794 Tel 815-234-5441 June 19, 2008LTR: BYRON 2008-0056 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Elimination System (NPDES) Permit Number 1L0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report for Byron* Station, Units 1 and 2. This report covers the period of May 1, 2008 through May 31, 2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley J. AdamsPlant ManagerByron Nuclear Generation StationBJA\ZCAttachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron Station 00NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenviUe, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 610101L048313PERMIT NUMBERIA01 0i DISCHARGE NUMBER IMONITORING PERIODYEAR I MONTH DAY YEAR I MONTH DAYFrom:l 0 a 1 0 1 5 01 I To:l 0 1 8 1 0 I 3I1 IMAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENTNODISCHARGE u I n m I ! !l I I I l I nIJflTE. O~4 in~t,..~-4frmn~

hofnrn ,~nnltinn than tnrmQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS, TOTAL SAMPLE 26) 4.6 <0.6 19) 0 285 ECSUSPENDED MEASUREMENT (26)_..._<0.6_<.6_(19) 0_285_E00530 1 0 0 -7!PERMIT..---.0l-.-..

-ONCE/'EFFLUENT GROSS VALUE REQUIREMENT-

"' i', L. 30.0 -.., MG/BS -MON:h --"".--,.*. ..... ..

DAILY.MAX'.,

____.___"-___-

CHROMIUM.

HEXAVALENT SAMPLE 2)9S(AS CR) MEASUREMENT (26) (19)01032 1 0 0

-. " LBS/DY -"-"-------

..MG/' DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT.

-: -.. --...30 DAYAVG-'-DILY MAX ._M__LON GRA_CHROMIUM, TOTAL SAMPLE -26) 19) 500(AS CR) MEASUREMENT 01034 1 0 0 ...." " ".".".' .G IDABS/DY GEFFLUENT GROSS VALUE REQUIREMENT

--; -30 DAY.AVG -DALYMAX "" M___DA _ ._RA_COPPER, TOTAL SAMPLE 26) 500(AS CU) MEASUREMENT (2___(9__

01042 1 00 .:ERMIT',",:

.-"LB.D *0.5 -1.0D M-. DA, GEFFLUENT GROSS VALUE REQ6UIREMENT.-

"DAILY MAX _________

__:""M_IRON, TOTAL SAMPLE ()95(AS FE) MEASUREMENT (26) (19) 50001045 1 0 0 P PE.ERMIT

...

_ 10. 10EFFLUENT GROSS VALUE .REQUIM " .' .* -' .30.AYAVG DALYA MG/L ." .",

DAILY .GRAB.LEAD, TOTAL SAMPLE 26) (19) Soo(AS PB) MEASUREMENT

-... (26) ( 501051 100 'PERMIT -L Y0.2, 0.4 DAILY. GRABEFFLUENT GROSS VALUE -REQUIREMENT

" : '. 30 DAY AVG: D.Y MAX.MGNICKEL. TOTAL SAMPLE _)95(AS NI) MEASUREMENT (26) (19) 50001067 1 00 .:PERMIT.

, -LBS/DY MA30LYAYAVG "DAILYMAX EFFLUENT GROSS VALUE -'REQiREMENt.

L- > 730 AL M -NAMEMYLE I certiy under penalty of taw that this doatmetut and all atchmentts were prepared uider my TELEPHONE

.,DTPRINCIPAL OFFICER directin or supegm in accordance wdh a system desge to assue tha qualfi-ed pesonnet

_l_ ___property gather and evabue the inJfodion sumited.

Based anM ayinqzfY of the person of persons 815 1406-3700 Bradley J. Adams who manage the systm or those persons directly responsae for gathenng the Woarmadon.

the 08 06 19tonmation submitted is, to the best of my knowledge and betief, tue, aCcurate.

and complete.

I am SIGNAKRE OF PRINCIPLE

_.Plant Manager a tarehtat there are sigitanM penalteslorsubtntiftkg false mlkcig the possully of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAY rm1 and imprisionment for Wnowg violationsI AUTHORIZED AGENT CODE ME EA OTCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water dunng this month.2. Flow existed 25 of 31 days during this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 Horth, German Cthurch RoadByron, IL 61010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBERI MONITORING PERIODIYEAR I MONTH I DAY I I YEAR I MONTH I DAY IOCRO501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT* -NO DISCHARGEEJ I ---I .. ...I -.II --...-. .I IFrour.,1 0 8 8 1 05 10 1 1 1 'To: 1 0 18 10 1 5 1 3 1 1 1NflTF ~ inqtnrtinn~

h~fnm r~amnIntino this farm: R ifre enQUANTITY OR LOADING QUANTITY OR CONCENTRATION FREQUENCY SAMPLEPARAMETER No. OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC, TOTAL SAMPLE261950 (AS ZN) MEASUREMENT

() (19) 50001092 1 00 ~ PEP'MIT' 2-0 'DALY". GRASEFFLUENT GROSS VALUE 'RE:,J.E,.

NT- " -... -" 0.... LBS/DY "-.,YWAG.

MG. D..YFLOW, IN CONDUIT OR SAMPLE 0.35THRU TREATMENT PLANT MEASUREMENT 0.034 0.116 (03) 0 135 CN50050 1 0 0 ".'MG-RERMIT

... R-'EPOR-`

JEFFLUENT GROSS VALUE REQUIREMENT

-30 DAýAVG :DAILYMAX

___MGD " " ' " 'SAMPLEMEASUREMENT

-._-"P,__ __ __ _ __ -R OtRMiENT.-

.. ,.___ _ .-, __.,. -__ ._" ____ -_ -._-.____-..

.. _ ___._ _.. .. ...._*_... ..SAMPLEMEASUREMENT

-PEOU MI -".i...-: :'REhtUUII1EM*

,T-; _ , ,.- * , .__. *i,_-,. ..._SAMPLEMEASUREMENT

_ "REQUIREMENT.

_-'_-.._'

_ "___"" _.. _ " -" ..'_. "' 'SAMPLEMEASUREMENT FIEERMIT.

--REQUIREMEN4T.'-____________________

SAMPLEMEASUREMENT, R E R M E. N., ..T..- .. _... *.tE U-EN * --..- , -.. ..'.* ..:: .-"_'._____"".

.,_"" , ." ' "_. .__1_." _-NAME/TITLE I cenriy under penalty di law tmat ils doament and au atacimens were prepared under my PRINCIPAL EXECUTIVE OFFICER direction or m a tance with a system dsigned to assure i am qualified pina TELEPHONE lropesty gather and evatute the inmatrnisuht.

Based me my inqusy DO the pem or pe.mBradley J. Adams who manage the system, or those persots drecty respumte tfr gathering tthe ____________the 815 4063700 08 06 19inflonation swwued is. to Me best od my kndge ard belef. tu accurt, and comlet. I am SIGNATUIE OF PRINCIPLE Plant Manager aware that dtare are signidicant penatifesfor surmittifalseg Irnonmiaton includig the EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTPED OR PtTED fine and ipsissonent for knowing m utations.

AUTHORIZED AGENT CODE NUMBE YEA MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3199) SD PAGE 2 OF 2Laa NATIONAL POLLU' 9 ISCHARGE ELIMINATION SYSTEM (NPDESDISCH AGE MONITORING REPORT (DMR)PERMITIEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenviie, IL 60555FACLITY Byron Nucleaw Power StatenLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERB01 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTP EFFLUENT (FORMER 0015)EFFLUENT"." NO DISCHARGEE"O~4j.. *.. .,, ~nnainthis formI MONITORING PERIOD IY EAR I MONTh DAY 1 YEtA i;ONTH DAYII .I

l

4I

I

I * ..

IFrom:l 0 1 a 1 0 1 5 1 0 1 11 To:l 0 1 8 10 I5 3 11I I I I I W IQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OF TPPRMT AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISBOD, 5-DAY SAMPLE(20 DEG CASUEE 0.20 0.22 (26) 3.9 4.0 (19) 0 290 DC(20 DEG. C) MEASUREMENT 00310 1 0 0 :PERMIT.'-

..14.2:- ". "2 -. --30.0 ,: ..,p .MG" " TWICE/.-

'. JEFFLUENT GROSS VALUE REQUIREMENT.

':30.DAY AV0 "DAILY MAX:-_ SDY 7: 30.AYAVG-DAIYMAX --MONTH ... __"ph SAMPLE 728 7.73 (12) 0 290 GRMEASUREMENT 00400100

'PERMIT "% -J- -. 0 '--- -- 9.0.RA'.

U- TWICEJ GRAEFFLUENT GROSS VALUE REQUI MINIMUM .:. .MAXIMUM.

-MONTH ._-._.SOLIDS. TOTAL SAMPLESUSPENDEDLMEAME 0.07 0.07 (26) 1.4 1.7 (19) 0 290 DCSUSPENDED MEASUREMENT 00530 1 0 0 "" -ERMIT.-"14.2-LBSDY :'- .30.0 -. 60.0 -TWICE/ 4EFFLUENT GROSS VALUE 'REQUIREMENT.30 DAY.AVG 'DAILY MAX ..30 DAY. AVG DAILYM _MONTHFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 .-.". .REPORT REPORTM.

D ". ....Y CONTINEFFLUENT GROSS VALUE REQUIREMENr 30 DAY AVG -'DAILY'MAXW-DAILY.-.

" _-SAMPLEMEASUREMENT

___-REQUIREMENT

.. ., -._: _. -* .SAMPLEMEASUREMENT PEWMIT'.REQUIREMENT

.-' -_7 ...-- *.SAMPLEMEASUREMENT NAMErTIU I ceitfy under penalty of law that this documant and al attaclmnerns were prepared under my TELEPHONE 5 --/,-dg DATEPRINCIPAL EXECUTIVE OFFICER direction or supeivisi-n in atcocidance with a system designed to assure Ithat queffied personnelLEHNE-feDT property gamer and evalute the infnmation subntaeled Based an my nquiry of the person or peos. 815 406-3700 001Bradley J. Adams who manage the system. or those persans directly rmtsian e for gatheng the the 08 06 19information submitted is, to the best of my knowledge and beliel. true. acat-rate, and complute.

I am SIGNATURE OF PRINCIPLE Plant Manager awre that there are sigrificantaPi for Subwiing false kfiiOl, IncludiUg te posiblity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYOR PRO-ED fine and Imripdsnment for knowing vwwatos.

AUTHORIZED AGENT CODE NUMBER YEA MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments her)1. Row existed through this outfall 29 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE I OF 1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCR0501PERMITnEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvile.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313

_4PERMIT NUMBERF -COl 01 DISCHARGE NUMBERIMONITORING PERIODYEAR I MONTH I DAY I I YEAR I MONTH I DAYMAJOR(SUBR 01)F -FINALWWTP (FORMER ODIC)EFFLUENT.*NO DISCHARGE EJI -- I --- II -. IFrom:l 0 I 8 I 0 I5 1 0 1 11 To:1 0 1 8 1 0 1 5 I 3 111NOTE: Read instructons fere completin tis formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX AOF TYPE> <ANALYSIS TPSOUDS, TOTAL SAMPL(26) -0.6 2.8 (19) 0 240 DCSUSPENDED MEASUREMENT 0053W 1 0 a :-- M T : -:-.:" -1: -- ':% '" " " 15.0- " '- : ".'30.0.1 EFFLUENT GROSS VALUE REQUIREMENT...

-. -. ... --30 DAY-AVG DAILY MAX MO/L WEEKLY COMP24CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) 1_ (19) Soo01032 1 0 0 -Iir*~- .LB/Y01 '-0.2-REQIREMNT-MG/ .DAIL -. GRASEFFLUENT GROSS VALUE D-REQUIREMENT-.

" ..DIAY.AV-LDDALY MAX _____""CHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT

_26) (19) Soo01034 1 0 0 :.-. PERMIT--.-".Y

--1.0" 2.0 -EFFLUENT GROSS VALUE RUIREMENT'".'.

." Y ..-. 30 DAY AVGS. :DAOY M -: MG/L D Y GRACOPPER. TOTAL SAMPLE(AS CU) MEASUREMENT 26 19) 50001042 1 00 :FERMI .-S/: 0.5." .- 0 -. .AYGAEFFLUENT GROSS VALUE :REQUIREMENT"3.

DA-DY AVG- DAILY MAX *.IRON. TOTAL SAMPLE -(1)5 (AS FE) MEASUREMENT (26) (19) 50001045 1 00 -PERMIT"-"

"BS/DY -_ -... .. 1.0 MG/L DAILY GRABEFFLUENT GROSS VALUE -REUIREMENT--

"'- ".DAILYMAX

___ GRASLEAD, TOTAL SAMPLE -- 26)(AS PB) MEASUREMENT (1_) (19) 5000 1 0 5 1 1 0 0 .: E R M rT -- " " S D Y 2 -: "" " "" DEFFLUENT GROSS VALUE REQUIREMENT

-- .._ --.-*" 30 DAY AVG-. 'DAILY MAX ,NICKEL, TOTAL SAMPLE 26) 500(AS NI) MEASUREMENT (2__ _(19)_5_

001067 1 00 "PE3: .. .- ".0 .0LE.- MG/... -- .......,- v : " A ' ..Y -L .- -...DAIL .*-. L ".-G EFFLUENT GROSS VALUE --REQUIREMENT 7- .-"- AG DA-LYMAX

" -"I cert under penalty of law that 11M document and all attachments were epared under my TELEPHONE PRINCIPAL EXIECUTIVE OFFICER cireclon ouefrisi in accordanc with a 3sltsem designed to asur tha qulfe pesonel A , J -,e ATEproperty gather and evatute the information submitted.

Ba sn rmy intqury of the person or persons e(!fr I-, _ 700Bradley J. Adams who manage the system. or those pemons directly responsible for gathering the infornation.

the 815 ,406-7 08 06 19informatiorn submitted is. to the best of my knowledge and belief, true. accurate, and complete.

I am SIGNATURE OF PRINCIPLE0 Plant Manager aware thal there are snificant penaliesl or submitting false Informatnincludfg the posiflt a1 EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYr OR P fine and nnprisicoman for knowing violations.

AUTHORIZED AGENT CODE NME YA M THCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this outfall 16 of 31 days during the month.EPA Form 3320-1 (Rev 399) SD , PAGE 1 OF 2S0v 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010I IL0048313 PERMIT NUMBERF -Col 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENT... NO DISCHARGE

J[ MONITORING PERIODSYEAR I MONTHI DAY =YEAR I MONTHI DAYFrom:l 0 I 8 I 0 I 5 I 0I 1 To:l 01 8 1 0 1 5 1 3 1 1I I I I I I INOTE: Read instructions efore comoletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER N. OF AMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT (26) "_' (19) Soo01092.1.00.

PERMIT:'3-LBS/Y-A 10- 2.0 'MG/L 'DAILYEFFLUENT GROSS VALUE RENT -.... .... .DA. AV.DAL MAX.....

--..SAMPLEOIL AND GREASE SUE 26) <1.6 2.0 (19) 0 240 OR03582 10 0 PMIT. 15.0 2.EFFLUENT GROSS VALUE 'REOUIREMENT

-7MI .BDY -.AA... ":L GRABFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.030 0.054 (03) --- 0 135 TM50050 1 00 0j .- * * --P..EFFLUENT GROSS VALUE REQUIREMENT-30DiAY AVG'- DAILY.MAX".:f MOD .AL-- "'" --" -A TSAMPLEMEASUREMENT

_REQUIREMENT

.. -: ... .. --" ' "_._.-SAMPLEMEASUREMENT

--REQUIREMENT

.. " '::. :+' .:: ',, -- -, ... _- .-- .- -, .SAMPLEMEASUREMENT

PERMIT.SAMPLEMEASUREMENT_

.P R IT * .+ -.~. .t .-+ : .: ::'_____ RQIRMN....-~." ::".. ... ;' ---:: I*--- -.. ",, -": -" -::" "-'NAm~rTTLE I certiy under penalty of law tat hist document and all antdavents were prepared under m, TELEPHONE 4',,"2 -ObATEPRINCAPAL EXECUTVE OFRC direcntion or supeniisim in accordance wdh a system desined to assure that quaifiled personnel property gather and evatute the inomation suimtned.

Based on my ntqusy of the person or persons 815 406-3700Bradley J. Adams who managea the systern, or" those persons &ecdy resporlsole for gathering the inonoon,~

the 81 0-70 08 06 19intorittision submitted is. to the best 0o my knowledge and belied true, accurlae.

and complete emam SIGNATUAE OF PRINCIPLE Plant Manager aware that ftre ame.3Wircant penaltie for rubna"~ false infionrabon. the posib of EXECUTIVE OFFCER OR AREANUBRYA MOTDATYOPE and an Wiisn tar knowg vulabons.

AUTHORIZED AGENT DCODE_COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3Mu) So PAGE 2 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (OUR)OCRO501PERMITfEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERF _ DOIO 0I DISCHARGE NUMBERI MONITORING PERIODI YEAR I MONTH I DAY I I YEAR I MONTH I DAYMAJOR(SUBR 01)F- FINALRADWASTE TREATMENT (FORMER 0010)EFFLUENT"NODISCHARGEIZ I ! l Ii ---- i ....... i -- .- iFrom: 0 I 1 0 1 5 0 1 1 0 To:I 0 I 68 01 5 I 3111NOTE: Read instructions fore completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF AMPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPESOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT

( 26) ----.. 1.5 1.8 (19) 0 240 CP00530 1 0 0 :-"p; iwERMrT .-.1-.. " -.. .L D .---.-,. .M LLBSIDY MG1L WEEKL OISEFFLUENT GROSS VALUE REQUIREMENTQ-.

30 DAY AVG D-'. AILY"MAX

, ." ..OI AD RESESAMPLE

_OILANGREASE MEASUREMENT (26) <5.9 10.6 (19) 0 240 GR0358 V0lEMENT0 1T -' .-: :" LBS/DY 2-D. & .MG/L i WEEKLY GRAB-EFFLUENT GROSS VALUE REQUE 30 DAY-AVG -. DAILY'MAX:

..___FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.021 0.023 (03) -- 135 CN50010 afr RPOT REOT MGD 'DAILY CONTINEFFLUENT GROSS VALUE .:REOUIRM

-30:DAYAVG

-'DARLYMAX

__MGD__ __ _ _ " .SAMPLEMEASUREMENT

-;.RE-OUIREMENT..

" " ":-

..' " "SAMPLEMEASUREMENT

-PERMITI--REQUIR1,EMENT

-__SAMPLE-MEASUREMENT

-(-:PERMIT

.:."- -'l -:.-. -":: "-'= -::" " .. .-

--. I" .*SAMPLEMEASUREMENT

.. j-.... .... ..::,..R PERM IT ,- -" ..., .' , "..'MREQUIREMENT:_

-..:.... ........................--

_. .......NAMWEflILE I cattilly under Penalty oflaiw that the docurneni and alt ftzachmens were prepared under ny TE0IlOEg,;

O~TPRINCIPAL EXECUTiVE OFFICER direction or supenision in accordance wah a system designed to assure vt qualfied personnel P Tpropery gadwr and evakue do infornobon subnued.

Based on my mquq of the person or persons SIGNoUý O8 6Bradley J. Adams who nonage the o epersons drecty spons forfatentheoniation.

Me / 1 815 406-3700 08 06 19infonnation sub=Me is, to Me best of my kanowldege arid befief, amo, amcurat, and cornpite, I amin NTUEO PRINCIPLE Plant Manager aware that there are sigicant penalties for subtMg false umedmg the pos" od EXECUTIVE OFFICER OR AREA YEAR DAYnMORn and isionment for knowing violations.

AUTHORIZED AGENT CODNUMBER COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hem)1. Flow existed through this outtall 5 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE1OFiWW0 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010I IL0048313 PERMIT NUMBERE01 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORMWATER

" NO DISCHARGE I_ MONITORING PERIODI YEAR I MONTH I DAY I I YEAR I MONTH I DAY Ii I l lI l l lFrom: O 0 1 oI5 1 0 1 1 TO:~ 810 1 5 F1 3q I i I I I INOTE: Read instructions before completing this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OFTYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH .SAMPLE) 500MEASUREMENT

__(__2)_5__

00400 10 0 .PE.0T 9.'-Eo-o.o o -:-- 90. SU G PRIEFFLUENT GROSS VALUE R-E NNIMUM -PERMITT, SOLIDS. TOTAL SAMPLE 2)95SUSPENDED MEASUREMENT

-(28) ( 19) 500005 0 1 0.0 PEM.IT..

.15.0 .30.0EFFLUENT GROSS VALUE `REQJUNRIOEN~t

-EII --RA q SD ..-3 A AG DIYMX-......

.... : 30 DAY AVG:' ':DAILYMAX..,'

GL "... G A___.__. ... ..___ .,.___.,

-- PERMIT -..CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19) 50001032 1 0 0 E.,.PERMIT

.- 01., -:-: ,..;. ,.: ::- LBS/DY ,-CL *G/ DAILY _ .- ,.EFFLUENT GROSS VALUE -.REOUIREMENT

--& ... -." -'.-:.--

L .B..DY 0_0.G..-DIL GA.__ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ __ _ _ _ _ 30.DAY AVG .. DAILY MAX,,. *__ _ _ _,--,_- _CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT 28)01034 1 0 0 PE.MIT .. LSY 1.0 zo.o.,EFFLUENT GROSS VALUE REQUIREMENT-

." 30DAYAVGCOPPER. TOTAL SAMPLE 2)1_S(AS CU) MEASUREMENT 01042 1 0 0 -:-PERMIT

-,- .LBS/DY " 0.5 1.0 -G AL.RAEFFLUENT GROSS VALUE REQUIREMENT.

.... -30 DAY.AVG DALYMAX M_"D_'_ .RIRON, TOTAL SAMPLE _(AS FE) MEASUREMENT (26) (19) 50001045 1 00 .:PEWM. -" LBS/DY " -...MGL DAILY. GRAB:EFFLUENT GROSS VALUE 'REQUI E -' " .....- .-...30 DAY AVG .DAILY MAX. ".*_- *, .LEAD. TOTAL SAMPLE(AS PB) MEASUREMENT (28) (19) 50001051 1 0 0

---.2 ". /DY 0.2 ' .M.IREFFLUENT GROSS VALUE '.REQLUIIEMENT

... _D AVGAY. MLDAL GRA.NAMEMMTE I candiy under penafty ol law Mhal OWi document and all alladtinents Were prepared under myiTLEHN

-ODTPRINCIPAL EXECU'nVE OFFICFR duectio or supennsi m acodnce wih a sysern desiW to assure thai quaffiel persnel .properly gather and evalute the iformallon submitted.

Based on my m'uuy of the person or persons 815 406-3700Bradley J. Adams who manage the system. or those persons diry responmbe for gateme the 1ormation, the I3RE 0 F 19ifornation submitted is. to me best ot my Inoowledge and bele. true, accurate, and complete.

I am SIGNA OF PRINCIPLE Plant Manager aware that were are signiqcant penakles for submiltig false hItomnaton, including the possit"y of EXECUTIVE OFFICER OR AREArED OR MT ine and impmnatm for wnowng vcms. AUTHORIZED AGENT CODE NUMBER YEAR MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin duing the month.2. There was no discharge of processed steam generator chemical cleaning wastewater dunng the month.3. Flow existed throunh this oulfall 8 of 31 days during the month.EPA Form 332D-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 Nortih German Church RoadByron. IL 61010IL0046313 PERMIT NUMBERE01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORMWATER

"** NO DISCHARGE

...I *MONITORING PERIODYEAR MONTH DAY EAR I MONTH I DAYFrom:I 0 I 8 I 0 I 5 I 0I I To:l 0 1 8 1 0 1 1 3 1 1 1NOTE: Read instructions before comDlen this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISJNICKEL , TOTAL SAMPLE (2)( 9 o G A(ASNI) MEASUREMENT (19) 50001067 1 00 PERMI T -:- --10. MG/ A DALY GRABEFFLUENT GROSS VALUE REQUIREMENT

.... -LBS_)Y ..- 30DAYAVG DALYMAX.

"ZINC. TOTAL SAMPLE12519 AS ZN) MEASUREMENT (26) (19) 50001092 1 00 0"PERMIT-.

1.0 L....J..-

2.0: , MG/LEFFLUENT GROSS VALUE REQUIREMENT-

'- 3.DAY-AVG DAIL.YMAX MGL- DALLY GRABOIL AND GREASE SAMPLE 26) -1 2B 19) 0 90GMEASUREMENT (2-)12.0

-2 0.0.8 (1) T 2 GR_ _AS03582 1 00 PERMIT. -"-: LBS/DY .."15.0 200 -TWICE/'...

__._.. .L.::...

-".30.DAY AVG .DAILY MAX MG/ -MONTH ."GA..EFFLUENT GROSS VALUE REQUIREMENT 290 TM;___ _____ _______FLOW, IN CONDUIT OR SAMPLE 0.135 0.360 03)THRU TREATMENT PLANT MEASUREMENT 0W3CE20 PERMRIOTT.

-.MON.TWIH50050 1 0.PE -. ..MGD :-.--' TOTALIZ.EFFLUENT GROSS VALUE .REQUIREMENT:

' DAY.AVG

-DALY X M DAX " .. ".MONTh _SAMPLEMEASUREMENT

.PERMIT_"_ REQUIREMENT-.-

.-SAMPLEMEASUREMENT REQUIREMENT.

?::." --': " ""-"SAMPLEMEASUREMENT

-PERMIT~_______________REQUIREMENT.-

________

___ ____ ___NAMENflTLE ICeruy amder penany of k l~aw lie s documenvt and all aftadimeMi were prepared under my I~TLPOE JPRINCAPAL EXECiLMVE oFFICER direction or suPervisio in accordantce with a sAwate desoiged to assure thal qualihied persone=61~

____BrdlyJ.maa pr~erly gathe and evalue "h information submitted.

Base on MY inquirY at the person or personts 815 1406&3700 0619Bradley .Adams who fmang the systen or thoe persons deadl responsibe for gathering fth Infoonalio.

theNAUIE FPINILinf a-ort subied Is. to th bessl my nwledge and be"if. tue. ac, ra. and compet. an. GmPlant Manager aware that thmee are s a pe-"tie for s..n false infor-.ation.

iukdei te possis)y d EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH -DAYTYPR- -Rnr --" " AUTHORIZED AGENT COD....'E.."....

.COMMENTS AND EXPLANATION OF ANY VIOLA1iONS (Reference all attachmenta here),EPA Form 3320-1 (Rev 3 a99) SD PAGE 2e O 2aaUL NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvUle, IL 60555FACILITY Byron Nuclear Power Station 4450 NoM German Ctwmh PoadByron, IL 61010IL0048313 PERMIT NUMBERF_ __ 001 0DISCHARGE NUMBERiMONITORING PERIODMAJOR(SUBR 01)F -FINALCOOLING SYSTEM SLOWDOWNEFFLUENT.1t0I DtSCHARGMM Z'""I YEAR I MONTH IDAY I I T EARIAR MONTHI DAY0 ITorlo 0 1 ot015 31 , IFrolm:1 018 a ý_1 5 1i INOTE: Read instructions feoree oreuna tis ToerQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISPH SAMPLE -- 8.67 8.77 (12) 0 240 GRMEASUREMENT____________________________

00400 1 0 0 _ ' PERMIT .60 .-.-,6.00SU WEEKLY. GRABEFFLUENT GROSS VALUE -RE.UIREMENT

.U _A -____. "COPPER, TOTAL SAMPLE(AS CU) MEASUREMENT

( 26) 0.011 (19) 0 240 GA01042 1 0 0 oPERMIT.

.- i. -: -,--;-" LBS/Y -.L -."0.07.1EFFLUENT GROSS VALUE REQUIREMENT:"

-. --. .-DAILY-MAX.

MG/L ..WEEKLY GRABZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT

26) 0.023 (19) 0 240 GR01092 1 0 0 M ..% ". ,o.EFFLUENT GROSS VALUE ,RE(RkMENT.

"' .. LBS/DY .MG"I .EKY GRABOXIDANTS, TOTAL SAMPLERESIDUAL MEASUREMENT-

26) -(19) S34044 1 0 0 .'L PERMIT" " -LB0Y " ."-" .EFFLUENT GROSS VALUE REQUIREMENT

.- .-..* -- ., MGL. WEEKLYD MRABFLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 5o~~REOR

,REP...ORT......."D 50050 1 0 0 -Pm RT .D- EFFLUENT GROSS VALUE REQUIREMENT'~.

-0, DAY-AVG DIY M ....

" -'. :C -" ".'-CHLORINE.

TOTAL SAMPLECREINTAL MSMPEN- (26) 0.10 0.46 (19) 0 240 GRRESIDUAL MEASUREMENT________________

5060 1 0--.:PE IT.;., ..:.- : I;: :.= :..' "..- : .- .-., 'r ..02- : , 0.5 :,! " WEEKLY " GRAB "50060 1 0 0 ..PERMIT.-'.

LBS-DY ... .. .. DAILY MGZLEFFLUENT GROSS VALUE -. REQUIREMENT!

-. .-.-,......_....

-.--:. GB30DAY'AVG

-M_ * ._-_-.HYDRAZINE SAMPLEMEASUREMENT (26) (19) 50081313 00 PERMIT -A --.'" " 0-DLY WHEN.. GRABEFFLUENT GROSS VALUE -REQUIREMENT

-. _ 2- -_ ---DALY MAX .DISCHARGING NAMEfTITLE I- untlywder Pwalyoflaw at this documenit and, as--dmw weepepare nde -my f,, .'4 ql TELEPHONE PRINCPAL EXlECUflVE OFRCER dffe~n or suPenvislan ince wit a system *esineI to assure E LaNed PersonnelE DATEpoeify gauter and evalute mef ortwmatm suhntted.

Based nmy mqwry o the pe rstpon s ,814-7l06 Bradley J. Adams who manage Ue systeM or tts pearns dcrectly tespmble for Se" the infori. the SIGNATU1P 406-3700 19imnormatin subnitted is, to the best of my knowledge ea belel, true, accurate.

and complete.

i am SIGNA CIPLEPlant Manager aware that therG are S1gnItSMZ ftorsbmitahibflse mwturcg via PssiY d EXECUTIVE OFFICER OR AR NUMBER YAR MONTH DAYwVM OR MaW fre and PASsiomnent Wnwk vnk~ns."

AUTHORIZED AGENT CODE NUMBE ___R_______

COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments he,)Per Special Condition 4C., the maximum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF I NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCR0501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadI IL0048313 I I002 0I PERMIT NUMBERI IIDISCHARGE NUMBERIMAJOR(SUOR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWI STORMWATER

...NO DISCHARGE J.".[ MONITORING PERIODYEAR MONTH DAY YEAR I MONTHI DAYFrom:1 0' 1 I I5 1 0 1 1 1To:d 0 1 8 1 0 1 5 1 3 1 1I .I I I I I II I I I I IByron, IL 61010NOTE: Read insttrucions before comoletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FSAMPLEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH SAMPLEMEASUREMENT

-(12)D0400 1 0 0 PERMIT,--;-6.0:x.

SEE GRABEFFLUENT GROSS VALUE :REQUIREMENT.

-.-MINIMUM .....-- -..MAIMUM -PERI".SOLIDS, TOTAL SAMPLE 2__9SUSPENDED MEASUREMENT

-(19)D0530 1 00 -PERMIT. -- -LBS/DY G.15.0ERMIT SEE GRABEFFLUENT GROSS VALUE REQUIREMENT

" -" "' -30DA AVG". DAXLY MAX ' PERMIT -CHROMIUM, HEXAVALENT SAMPLE 26_9(AS CR) MEASUREMENT (2 (19)01032 100O "-PMh ' L.BS/DY 0.1 -02': MG/L DAILY. GRAB'EFFLUENT GROSS VALUE .:REQUIREMET.

.". """ 30 :DAY AVG. DAILY MAX.. "CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (2_)_ _19)01034 1 0 0 -EFFLUEN T GROSS VALUE RE- UIR EMENT' " --....::-' " LBS/DY 1.0. .2.0 MG&L ." DALY GRABEFFLUENT

".,_ _ : I- ...30DAYAVG

" 'DAILY MAX- " _....DOPPER. TOTAL SAMPLE (2)_9(AS CU) MEASUREMENT (26) (19)01042 1 0 0 -PEMIT':.

-TBSDY" 0.5; 1.0EFFLUENT GROSS VALUE REQUIREMENTU

-... L/Y -". "'- .. .30-DAY.AVG DAYMAX. MG/L .DALY GRABIRON, TOTAL SAMPLE 26_9(AS FE) MEASUREMENT (26) (19)01045 1 00 ' PEIRMIT--

LBS/DY R--' 1.0- 1.0.--..

DALY GABEFFLUENT GROSS VALUE oREQUIREMENI,

-. ",-.. -_ , .30-D.AY.AV

-" DAILY MAX.-,- 'GRAB..LEAD, TOTAL SAMPLE (2_) --_9(AS PB) MEASUREMENT (26) (19)01051 1 00 D..APERMIT"

.LYEFFLUENT GROSS VALUE REQUIREMENT

...... -"7 .BY -30 DAY-AVG DALY-MAX MG. I..- D ." GRABNAMErrTmLE I certity under penalty of law that uhs drjmaent and alt attachnents were ,repaMed under my TELEPHONE PRINCIPAL EXECUTIVE OFFICER direction or 5upemsiwn m accordance with a system designed to assure that qualified persoin" 4property gather end evatute the Wnonmaen submited.

Based an my inquiry o the person or peronsBradley J. Adams who manage the system, or thse persons dieaty responsibe for gafering the inflomation.

T 815 406-3700 08 06 19Inomto submitted is, to Whe best of my knowledge and boldt, trie, accurate.

and compheire, Iam SIGADEO PRINCIPLE Plant Manager aware Mat there are s9tificant penates for submitting false information.

Including the possibt o1 EXECUTIVE OFFICER OR AREArVED OR PlaMn te and imorsionmen for Imoing I AUTHORIZED AGENT CODENUMBER YEAR DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hee)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. This discharge point was not used this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 20S 0NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

U 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010I IL0048313 I PERMIT NUMBER002 0DISCHARGE NUMBERMONITORING PERIODYEAR I MONTHI DAY ] I YEAR I MONTH I DAYOCRO501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

"*" NO DISCHARGE r "l

l

l

lI .l .l .IFrom:I 0 I 8 I 0 I 5 I 0I 11 To:1 0 1 8 1 0 1 5 1 3 11NOTE: Read instructions before completing this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISNICKEL, TOTAL SAMPLE (26) 19)(AS NI) MEASUREMENT (26)__ _ __ _01067 1 00 -'_:_ T -.- 10 2.0 -. MG/ DAL GR10EFFLUENT GROSS VALUE ..REQUIREMENT..

--: LB 30 AYAVG -.DAILYLMMAX MG/L_ : ___. _ZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT 01092 1 00 :0PERMITr

" -..0 -2.0 M .DAL GA.EFFLUENT GROSS VALUE REOUIREMENT.

--LBS/DY ,-30 DAY.AVG .- DAILY MAX: MG/L DAILYOIL AND GREASE SAMPLE 26) 19)MEASUREMENT

_ _ (26)_(19) 03582 1 00 Pj: W 1 rfLBSDY __ ' ."15.0" -. 20.0. MG""CE/ -G03582 1 0 0 .-30 DAY..LYMDX-

-MO. .REFFLUENT GROSS VALUE ,.A,%,,*T

.__.__*_""

FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT (03)50050 1 0 0 .-'-PERMIT'-"7'

-,REPORT""-

REPORT -TWIEFFLUENT GROSS VALUE R.EQUIREMENT 30 DAY-AVG'.""

.A MGD MONTH .-..SAMPLEMEASUREMENT

______________

.REQUIREMENT

...-- ___ ____ ____ __SAMPLEMEASUREMENT

'PERM1('F`.

I.,_ _ _ REQOUIREMENT

-.: .- 7SAMPLEMEASUREMENT

-PERMIT*

.--. .. -__________

EQUIREM4ENT 72-N MTIE I cantily utnder penalty of law that this document and aD attachments were prepared under my .I TELEPHONE EPRINCIPAL EXECUTIVE OFFICER diectimi or superimia in ac~clance wilt a system desined to assure t0 al qialffed personinel fATE I'property gather and evalue the infornautio ne Based on amy Inquiry d the person or peons 5 406-3700Bradley J. Adams who manage the system, or persons diecly responwite ftr ahering th bntormaton.

the 08 06 19infomiation submitted is. to the best of my knowledge and befid. true. accurae.

and complete.

I ai SIGNATU OFPRINCIPLE Plant Manager aware that them are significant penalties for submitting false inflormalion.

includig the possibty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED~ POR iree ald r d foI knowing vidatis.

AUTHORIZED AGENT JODE_COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hem)EPA Form 3320-1 (Rev 3199) SD PAGE 2 OF2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 May 2008BLOWDOWN TEMPERATURE MONITORING:

0Date05/03/0805/10/0805/18/0805/25/08Calculated MaximumAllowable BlowdownTemp. (Degrees F)120120120Maximum ActualBlowdown Temp.(Degrees F)78.679.978.489.1120Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of May 2008.0TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/AK:\BYRCH\BYRON.DB\Clerk\Monthly Discharge Monitor Rpt\2008 Reports\,May\ATTACH01

.doc ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 May 2008COMMENTS:

I. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.

Discharge Monitor Rpt\2008 ReportsWlay\ATrACHO I.doc EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

(Minutes)

U-__1, U-2 1U-_ U-205/01/08 35 38 05/08/08 55 4905/02/08 31 32 05/09/08 50 5005/03/08 32 30 05/10/08 50 5005/04/08 32 29 05/11/08 50 5005/05/08 40 4005/06/08 40 4005/07/08 40 40HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 05/05/08Time: 11:53Analyzed by: J.E.D.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26.0.240.220.200.18.0.160.140.120.100.080.060.040.020.000 25 50 75 100 125Minutes150 EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes) u-___U-I U-205112/08 50 5005/13/08 50 50.05/14/08 50 5005/15/08 50 5005/16/08 40 4505/17/08 50 5I05/18/08 42 42HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 05/13/08Time: 10:19Analyzed by: M.H.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.50-i, -0.48 ]0.460.44 [I ['0.420.40 I -0.38 -10.36-0-34-lE0.30 -I0.28-E 0.26--------------

------------0.24 --...- -I_ _0.22-0.20-0.18 .*0.16 -I'0.14 1 *0.12 -]'0.10-0.08-0.06 ..,.I0.04-0.02 ----0.00 I I0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

-_..__.U-I U-205/19/08 41 3905/20/08 37 4005/21/08 38 4005/22/08 35 3605/23/08 40 3505/24/08 40 4005/25/08 36 36HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 05/19/08Time: 10:50Analyzed by: J.P.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.48 -'-- -- -~ 1 F0.44 N .-.I0.42 ---1--rII-0.400.38 --~ ---- I0.36 -I--0.340.32 z t Iz0.28 -S 0.26 !CL" 0.240.220.20

'0.180.140.120.10 --0:08 ~--- ---- --10.06 -0.04 F0.02 -- ----.---------I0.000255075Minutes100125 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Dosing Time(Minutes)

U-1 -05/26/08 35 4005/27108 34 4305/28/08 55 5505/29/08 55 5605/30/08 39 6005/31/08 41 41HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 05/27/08Time: 10:08Analyzed by: D.L.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.50 F 1 1 r0.48- t j I t I I _ _0.46---0.44----

I I0.42- 10.40 I t0 --.-. I ,__ -10.28 -t -2 0.26-- --70.20 --0.18 -0.16 ---0.10--- --0.14 -0.120 i I0.08-0.:06 -..----_0.02 4 I0.000255075Minutes100125150

' Exek nsmExelon Generation www.exeloncorp.corn NuclearByron Generating Station4450 North German Church RoadByron, IL 61010-9794 Tel 815-234-5441 July 18, 2008LTR: BYRON 2008-0070 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Elimination System (NPDES) Permit Number 1L0048313,

.issued September 8, 2000, we are submitting the Discharge Monitoring Report for'Byron

Station, Units 1 and 2.. This report covers the period of June 1, 2008 through June 30, 2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley'J.

AdamsPlant ManagerByron Nuclear Generation StationBJA\ZC\sdk Attachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron Station PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, L 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)lL0048313 AA01 0PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIOD[YEAR I MONTH I DAY YEAR MONTH I DAYFrom:l l 0 1 l8 6101 To 0 181 0 16131 0OCR0501MAJOR(SUBR 01)F. FINALDEMINERALIZER REGENERATE (001A)EFFLUENT* *

NO DISCHARGE

'JNUIE: Riead instructions fetore competin this tomQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS, TOTAL SAMPLE 1 26) < 1.9 1.9 (19) 0 285 ECSUSPENDED MEASUREMENT 26__9<_._1 0_285 EC00530 1 0 0 PERMLIT -15.0 30.0 ONCE/EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MG/L MONTH __MP-8CHROMIUM, HEXAVALENT SAMPLE 1 26) 19) 500(AS CR) MEASUREMENT (26) __19)_500 01032 1 0 0 PERMIT A LBS/DY 0.1 0.2 MG/L DAILY GRASEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXCHROMIUM, TOTAL SAMPLE 2_95(AS CR) MEASUREMENT (26) (19)01034 1 0 0 PERMIT LBS/DY 1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MGL DALY GRABCOPPER. TOTAL SAMPLE 1 26_9 500(AS CU) MEASUREMENT (26) (19)01042 1 0 0 PERMIT LSiDY .0.5 1.0EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXIRON. TOTAL SAMPLE(AS FE) MEASUREMENT (26) (19) 50001045 1 0 0 .PERMIT .BS/DY 1.0 1.0EFFLUENT GROSS VALUE REQUIREMENT

-..30 DAY AVG DAILY MAX MG/L DALY GRABLEAD, TOTAL SAMPLE 26) 19)5(AS PB) MEASUREMENT (26) (19) 50001051 1 0 0 PERMIT -0.2 0.4EFFLUENT GROSS VALUE REQUIREMENT

.LBSIDY 30 DAY AVG DAILY MAX MGIL DAILY GRABNICKEL, TOTAL SAMPLE 12)9 500(AS NI) MEASUREMENT-( 26) -(19)001067 1 0 0 PERMIT LBS/DY 1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT

______ 30 DAY AVG DAILY MAX MG/L DALY GRABNAME/TITLE I certify under penalty of Law that this document and all attaclnents were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or superision in accordance with a system designed to assure Mat qualified pensonnel

-4pvpdy gather and evalute te ifrmbnsubmitted.

Based on my inquay of fth person or persons 854630Bradley J. Adams who manage the system, or trsas persons directly responsible far gatenng the information, th 08 07 18information submitted is, to the best of my IMowledge and beelf, t.ue, accurate, and complete.

tamn SIGNATURE OF PRINCIPLE Plant Manager aware that them are significant penajties for subitting false information.

including the possf"ty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PPRINTED fnme and impnsionment for knowing violatons.

AUTHORIZED AGENT CODCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed 12 of 30 days during this month.EPA Form 3320-1 (Rev 3/99) So PAGEI'OF2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMR'TEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENTNODISCHARGE I MONITORING PERIODYEAR I MONTH I DAY IYEAR MONTH DAYFrom:l 0 1 8 I 0 I 6 I 01 1 1 To:I1 0 1 8 1 0 6 1 3 1 0 1I i I I I I II l I I I i INUI OT: Reaa instrucuons feiore comuno t.hII iorrnQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC, TOTAL SAMPLE 26) 19)50(AS ZN) MEASUREMENT (26) (19) 50001092 1 0 0 PERMIT LBS/DYL__/DY1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT

._ _ *_ 30 DAY AVG DAILY MAX MGi DAILY GRABFLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.013 0.062 (03) 0 135 CN50050 1 0 0 PERMIT .REPORT REPORT MGD DAILY CONTINEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXSAMPLEMEASUREMENT PERMITREQUIREMENT

_ _SAMPLEMEASUREMENT PERMITREQUIREMENT

__.. ...SAMPLEMEASUREMENT PERMIT"REQUIREMENT..

.SAMPLEMEASUREMENT PERMITREQUIREMENT

-SAMPLEMEASUREMENT_

PERMITREQUIREMENT

-._._- ._ .NAME[TITLE I cerby wnder penalty of law that tiNs document and all attacments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supervision in accordance with a system designed to assure that qualified personnel prop" ygather and evalute the ifrainsubmitted.

Based an my inilir of the person or persons Bradley J. Adams who manage the system1 or those pe8ons directy responsible for gathering the information, the 815 406-3700 08 078informalion sutitted is. to the best of my knol' edge and belief, true. accurate.

and complete.

I am SIGNA E OF PRINCIPLE Piant Manager aware that thee ae 9rniant penalties for submitfng false hiformabomn.

possily of EXECUTIE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRINTED fine and uromnem for know viola. AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF2 NATIONAL POLLUTANT*HARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 610101L0048313 PERMIT NUMBERFB01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALSIP EFFLUENT (FORMER 001B)EFFLUENTNO DISCHARGE MONITORING PERIOD IYEAR MONTH I DAY I I I MONTH I DAY IFrom:10 I I 0 I 61 o I11 To:L10 18 1 0 L 6 I 3 10 1NOTE: Read instnjctions efore completing this formQUANTIlY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEBOD, 5-DAY SAMPLE(20 DEG. C) MEASUREMENT

< 0.36 0.59 (26) < 5.5 8.9 (19) 0 290 DC00310 1 0 0 PERMIT 14.2LBS/DY 30.0 60.0 TWICE/EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DALY MAX .___._ 30 DAY AVG DAILY MAX MG/L MONTH COMP24PH SAMPLE --7.46 7.53 (12) 0 290 GRMEASUREMENT 00400 1 0 0 PERMIT 6.0 9.0. TWICE/EFFLUENT GROSS VALUE -REQUIREMENT

__--_MINIMUM

_ MAXIMUM " _SU MONTH GRASSOLIDS. TOTAL SAMPLESUSPENDED MEASUREMENT

< 0.04 0.047 (26) < 0.6 0.7 (19) 0 290 DC00530 1 0 0 PERMIT 14.2 28.5 30.0 60.0 TWICE)EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX LBSDY 30 DAY AVG DALY MAX MG/L MONTH __MP_4FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.006 0.010 03) 0 135 CN50050 1 0 0 PERMIT REPORT .REPORT ...._EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MGD DAILY CONTIN.SAMPLEMEASUREMENT PERMIT.REQUIREMENT SAMPLEMEASUREMENT PERMIT "REQUIREMENT

"__. -_SAMPLEMEASUREMENT PERMITREQUIREMENT

-NAME/TnTLE I cear under penalty of law that this docurnent and ag attachments were prepared under my /.,, TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or superviion in accordance with a system designed to assure that qualiried personnel propertygather and evade the ronaborin Based anmy iniuy oi the erso-n or O'FPI 854-3Bradley J. Adams w manage te system. or those persons directly responsible for gathereng the nformatjon, the 108 07 18information subnitted is, to the best of my knowledge and belief. tre, accurate, and ompete am SIGNATU OF PRINCIPLE Plant Manager awam that there are significant penalties for subaitting fase infronnarmi inclding the possbft of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRINTED 7 and f for knowing vwons. AUTHORIZED AGENT CODE NUMBER Y MCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. Flow existed through this outfall 30 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OFi NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMI'TEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERICo0 0I1 DISCHARGE NUMBERMAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENTI MONITORING PERIODI YEAR I MONTH I DAY I I YEAR I MONTH I DAYI I I II -I -I ", " IFrom:! 0 181016 0I1 "1To: 1 0 1 8 I01613101***NO DISCHARGE ED ..t l l ;NOTE: Read instructions before comolefin this formQUANTITY OR LOADING-QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS Ex ANALYSIS TYPESOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (26) 3.0 7.5 (19) 0 240 DC00530 1 0 0 PERMIT LBS/DY 15.0 30.0 MG/L WEEK'Y COMP24EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX M ECHROMIUM, HEXAVALENT SAMPLE 2)95(AS CR) MEASUREMENT (28) -(19) 50001032 1 0 0 PERMIT -01 0.2 LGSDAILY GRASEFFLUENT GROSS VALUE REQUIREMENT

' 30 DAY AVG DAILY MAX M/_LGRCHROMIUM, TOTAL SAMPLE 2)95(AS CR) MEASUREMENT (26) (19) 50001034 1 0 0 PERMIT ____ 1.0 .2.0EFFLUENT GROSS VALUE REQUIREMENT LBSIDY 30 DAY AVG DAILY MAX MGL DALY GRABCOPPER, TOTAL SAMPLE 2)95(AS CU) MEASUREMENT (19) 50001042 1 0 0 PERMIT % I.BSDY 0.5 1.0 MG/L DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MIRON. TOTAL SAMPLE 26_9 500(AS FE) MEASUREMENT (1501045 1 0 0 .PERMIT -1.0 1.0EFFLUENT GROSS VALUE REQUIREMENT

-,- L 30 DAY AVG " DAILY MAX MGJL DAILY GRABLEAD. TOTAL SAMPLE 2)95(AS PB) MEASUREMENT (28) (19) 50001051 1 0 0 :PERMIT --LBS/DY -0.2 0.4EFFLUENT GROSS VALUE REQUIREMENT

.... * "--'_-_ 30 DAY AVG DAILYMAX MGIL DAILY GRABNICKEL, TOTAL SAMPLE 26) 19) 500(AS NI) MEASUREMENT (26) _(19)_500 01067 1 0 0 PERMIT. ' " LBS/DY -10 2.0 MGIL DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT

.30 DAY AVG' DAILY MAX MLY GNAUEITITE I cenify under penalty of law that this document and all attachments were prepared under my TLPOEDTPRINCIPAL EXECU1nE OFFICER direction or supenvision in accordance with a system designed to assure tdim 4ato d personnel properly gather and evalute the information Based on my irqury of the person or personsBradley J. Adams who manage the system. or those persons directly responsrae for gathering the ifformation.

the 815 -08 07 18information submitted is, to the best of my knowledge and belief. true, accuiate.

and complete.

amn SIGNATURE OF PRINCIPLE Plant Manager aware that there are sigrnicant penalties for submitting false infotnaton, including the possibtity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYM-PED OR Ine and initlrsonrmet for knowing violations-AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this outfal 15 of 30 days during the month.EPA Form 3320-1 (Rev 3199) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERCol 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENT.NO DISCHARGE I MONITORING PERIODYEAR MONTH DAY I I I MONTH I DAYFrom:1 0 I 8 I 0 I 6-1 0 I1 I To: 0 1 8 E 0 IT I3 0I I I II I I Ii i i I I I lByron, IL 61010NOTE: Read instructions before completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISZINC, TOTAL SAMPLE 26) 19_0(AS ZN) MEASUREMENT (26) (19) 50001092 1 0 0 PERMIT ..." SD1.0 2.0 DALY GRAS-EURMN LBS/DY MG/LDAY GAEFFLUENT GROSS VALUE REUIREMENT_

'

30 DAY AVG DALYM MAXOI N RAESAMPLE

_______OILANDGREASE MEASUREMENT (26) <1.9 3.0 ( 19) 0 240 GR03582 1 0 0 PERMIT -LBSIDY 15.0 20.0 MGAL WEEKLY GRABEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DALY MAXFLOW. IN CONDUIT OR SAMPLE 0.35THRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 PERMIT REPORT REPOTDALY TOT.IZ.EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXSAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMIT -REQUIREMENT

...SAMPLEMEASUREMENT PERMITR E Q U IR E M E N T .. .. _ ._-_ _ _"_.SAMPLEMEASUREMENT PERMIT .REQUIREMENT

~NAEfTITLE I certify unde' Penafty of law that this document anid aff attachmrinrth ware prepaed under my I ' ITELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supenri in accordance with a system designed to assure that qualified personnel_

p'opedy gatnef antdevalutoft infornatrmson Based an my incquiry of the Ke-n of persons 815 406-3700Bradley J. Adams who manage the system. or those persons directty responsible for gatering "e inforatJon, me 85 030 08 07 18information submLitted is. to the best of my knowledge and belief, true. accurate.

and complete.

I am SIGNATU OF PRINCIPLE Plant Manager aware Hiat there are signrficant penalties for sutiding false titommAn.

Inding fmet possikty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRINTED ne ard uimient for knowing violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF J2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER001 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 0010)EFFLUENT***NODISCHARGE MONITORING PERIODYEAR I MONTH AY I YEAR MONTH DAYFrom:j 0181016101 1 ITo:! 01810161 31 0NOTE: Read instructions fore comtetin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION No. FREQUENCY PARAMETER

___ _ N. OF SAMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS E ANALYSISSOLIDS. TOTAL SAMPLE 2.14SUSPENDED MEASUREMENT (26) <1.4 2.2 (19) 0 240 CP00530 1 0 0 PERMIT -IDVDY 15.0 30.0 M MG/L WEEKLY COMPOSEFFLUENT GROSS VALUE REQUIREMENT 30DDAY1AVG DAILY MAXOI NDGEAESAMPLE

__OILAND GREASE MEASUREMENT (26) <6.1 11.3 (19) 0 240 GR03582 1 0 0 PERMIT LBS/DY 15.0 20.0EFFLUENT GROSS VALUE REQUIREMENT LBS/DY 30 DAY AVG DAILYFLOW, IN CONDUIT OR SAMPLE 0.31THRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 PERMIT REPORT REPORT MGD CONTINMGD -- ~DAILY COTNEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAXSAMPLEMEASUREMENT PERMITREQUIREMENT SAMPLEMEASUREMENT PERMITREQUIREMENT

..SAMPLEMEASUREMENT PERMITREQUIREMENT

-SAMPLEMEASUREMENT

-PERMIT .REQUIREMENT

" ...NAMFin.E I certify under penalty of law that this document and at attachments were Prpared under my _ r/ TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supervision in accordance with a system designed to assure that quaffed personnel B Appeuly gather and evalute the mfornation submited.

Based on my mnquiry of the person or peros 815 406-3700Bradley J. Adams twho manage the system. or those persons directly responsible for gathering the imformaton, the T F P 08 07 18information submitted is. to the best of my knowledge and belief. true. accurate.

and compte. I am inIf tFPINCIPLE

_Plant Manager aware thal there are signdlcam penalties for submittang false information.

includng the Poesibfity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRINIW- tine and tipnslonnert for knowing .AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. Flow existed through this outfall 4 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF10 NATIONAL POLLUTANT DtSCHARGE ELiMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMrITEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERF -E01 0I DISCHARGE NUMBERI MONITORING PERIODYEAR MONTH.I DAY YEAR MONTH DAYFrom: 01 8 0 16 I 0 1 1 To:I 0 8 10 16 3 1 0OCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORMWATER NO DISCHARGE

[i i i i I I It l l l l & IByron. IL 61010NOTE: Read insltuctions before comoletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY S LEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSAMPLE ()PH MEASUREMENT (12) 50000400 1 0 0 PERMIT -6.0 9.0 .SEE GRABEFFLUENT GROSS VALUE REQUIREMENT

_ .- _-- MINIMUM MAXIMUM SU PERMITSOLIDS, TOTAL SAMPLE 2)195SUSPENDED MEASUREMENT (19) 50000530 1 0 0 PERMIT .15.0 30.0 SEEEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MG/L PERMITCHROMIUM, HEXAVALENT SAMPLE 26) 19_0(AS CR) MEASUREMENT (26) (19) 50001032 1 0 0 PERMIT 0.1 0.2EFFLUENT GROSS VALUE REQUIREMENT

--LBSIDY 30 DAY AVG DALY MAX MG/L DAILY GRABCHROMIUM, TOTAL SAMPLE 2)95(AS CR) MEASUREMENT (26) (19) 50001034 1 0 0 PERMIT -S.DY 1.0 2.0EFFLUENT GROSS VALUE 'REQUIREMENT

.. 30 DAY AVG DAILY MAX MGA. DALY GRABCOPPER, TOTAL SAMPLE 2)95(AS CU) MEASUREMENT

26) (19) 50001042 1 0 0 PERMIT LBS/DY 0.5 1.0EFFLUENT GROSS VALUE REQUIREMENT

-L.'-30. DAY AVG DAILY MAX MGJL DAILY GRABIRON. TOTAL SAMPLE 2_)__ 500(AS FE) MEASUREMENT (26) (19)01045 1 0 0 PERMIT --D 1.0 1.0 MG& DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT 311,3-DAY AVG DAILY MAXLEAD, TOTAL SAMPLE 2)1)5(AS PB) MEASUREMENT (26) (19) 50002/D 0.4L DAILY GRAB01051 1 0 0 PER--MITrn 3O .2AV DALMX _______4_

___EFFLUENT GROSS VALUE REQUIREMENT 30LBDY GL DAYAVG DAILBNASAEJ1TLE I certiy under penalty of law that this document and all attachments wer prepared under my TLPOEDTPRINCIPAL EXECUTIVE OFFICER :diection or supervision in accordance with a systwn designed to assTLe tEPat HOified peDsonnel propery gather and evatute the information submitted Based an my nquiry of the person or persons'406-3700 Bradley J. Adams who manage the system, or those persons directly respons.be for gathering the information.

the 08 07 18information submitted Is. to the best of my knowedge and beief, true, acpjrate, and complete.

Inam SIGNATURE OF PRINCIPLE Plant Manager aware that there ae significant penalties for subm"t fase information, incuing the possbity of EXECUTIVE OFFICER OR ARFA NUMBER YEAR MONTH DAYTYPED OR PRINTED fine and imnprsionment for knowing violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through this outfall 3 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF2 PERMIrTTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDESDISCHARGE MONITORING REPORT (DMR)IL0048313 I E010PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIODYEAR MONTHI DAY YA I MONTHI DAYFrom: 0 18 10 16 10 1 To:I0 8 0 6 13 10s)OCR0501MAJOR(SUaR 011)F -FINALSTORMWATER (FORMER DOI E)STORMWATER

*

NO DISCHARGE

[]NOTE: Read instructions betore completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPENICKEL. TOTAL SAMPLE(AS NI) MEASUREMENT (26) (19) 50001067 1 0 0 PERMIT 1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT

-* ' 30 DAY AVG DAILY MAX MGL DALY GRABZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19) 50001092 1 0 0 ..F rIT LBS/DY 1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT

._.._--.,_

._ _ 30 DAY AVG DALY MAX MG/I DALY GRABSAMPLE ______OIL AND GREASE MEASUREMENT (26) < 1.4 < 1.4 ( 19) 0 290 GR03582 1 0 0 PERMIT "__Y

15.0 20.0 TWICE/EFFLUENT GROSS VALUE REQUIREMENT

"_._.......

._._- _ 30 DAY AVG. DAILY MG/L MN GRABFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.096 0.209 03) 0 290 TM50050 1 0 0 PERMIT REPORT REPORT MGD TWICE/ TOTA"Z.EFFLUENT GROSS VALUE REQUIREMENT 30-DAY AVG DAILY MAX M --MONTHSAMPLEMEASUREMENT PERMITREQUIREMENT

-__..SAMPLEMEASUREMENT PERMIT.REQUIREMENT

--.." -_- " "SAMPLEMEASUREMENT, PERMIT. -_"REQUIREMENT

_ _" _NAFqrE I Certify under Penalty of law Mi thais document and all afladiments were Prepared under m~y -14 TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER d e sospervision i acconiance with a system desgned to assure that qualified pemonnelBl Aperty gathe and evalute te intormation submitted.

Based on my inquir af the person or personsBradley J. Adams *nwho manage the system, or those persons directly responsible for gatherng the information, the 815 40&3700 08 07 18information submitted is. to the best of my knowledge and belief, tue, accurste.

and complee.

I am SIGNATURE OF PRINCIPLE Plant Manager aware that there are sigrificant penalties for submitting false information, including the possiblity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAY*YPEO ---f .ine and miprisionment for knowing violations.

AUTHORIZED AGENT CODCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2 0PERMITTEE NAMEIADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 001 0PERMIT NUMBER DISCHARGE NUMBERIMONITORING PERIODlOCR0501MAJOR(SUBR 01)F -FINALCOOLING SYSTEM BLOWDOWNEFFLUENT* NODISCHARGE I YEAR MONTH DAY I YEAR I MONTH I DAYFrom:1 0 8 I0 1 6 I 0 1 1 1 ToL0 1 8 10 1 6 1 3 1 0INOTuE Ra i- nstructions before compiwun ahi ontQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS X ANALYSI TYPEPHSAMPLE

___ ______PH MASUEE 8.53 8.82 ( 12) 0 240 GR-MEASUREMENT

,00400 1 0 0 PERMIT 6.0 9.0EFFLUENT GROSS VALUE REQUIREMENT

_ MINIMUM MAXIMUM WEEKLY GRABCOPPER. TOTAL SAMPLE 26) 0604(AS CU) MEASUREMENT

26) -0.016 ( 19) 0 240 GR01042 1 0 0 PERMIT -__0.0?10104 1 0 ERMT "LBS/DY ""071 MG/L WEEK'LY GRABEFFLUENT GROSS VALUE REQUIREMENT MGLWDAILY MAXG..ZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT (26) 0.125 (19) 0 240 GR01092 1 0 0 PERMIT " LBS/DY 1-0EFFLUENT GROSS VALUE REQUIREMENT

-SDAILY MAX-: MG/L WEEKLY GRABOXIDANTS, TOTAL SAMPLE 26) 19_0RESIDUAL MEASUREMENT

() 19) 50034044 1 0 0 PERMIT 00LSDY -0.05 MG/L WEEKLY GRABEFFLUENT GROSS VALUE REQUIREMENT DAILY MAXFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 21.40 32.48 (03) 0 135 CN50050 1 0 0 PERMIT REPORT REPORT DIYNEFFLUENT GROSS VALUE REQUIREMENT 30 DAYAVG DALY MAX MGD --D-OTCHLORINE.

TOTAL SAMPLE 21i4RESIDUAL MEASUREMENT (26) 018 0.45 (19) 0 240 GR50060 1 0 0 PERMIT- .0.2 0.5:ItCUIEETLBS/DY "MG/L "" WEEKLY GRABEFFLUENT GROSS VALUE REQUIREMENT

-SD30 DAY AVG DALY MAXHYDRAZINE SAMPLE 26) 19) 500MEASUREMENT (26) (19) 50081313 1 0 0 PERMIT 0.031 DAILY WHENEFFLUENT GROSS VALUE REQUIREMENTI I Y -DAILY MAX MGIL DISCHARGING GRABNAMEITIIE Iceretiy undier penatty of law that this document and ag attachmnents were prepared under my TLPOEDTPRINCIPAL EXECUTIVE OFFCER dwecom or supervsion in accordance with a system designed to assure that quad peTEonnel properly gather and evauila the infoumation submitted.

Based on my ncluwiy of the person or personsBradley J. Adams who manage the system, or those direcly responsble for gathering the Information, e 815 406-3700 08 07 18infommation submitted is. to the best of my knowledge and belief, true. accurate, and complete.

I am SIGNATURE OF PRINCIPLE Plant Manager aware that there a significant penattie for submif " false ,fonnation, including the possibity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAY.mDo PND and inmprioonmenl for knowing violations.

AUHOIEDAGN CDTYPED OR PRINTED lmxmmnfdrkongiltm.I AUTHORIZED AGENT Io YEAR_ MOT DAY____COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)Per Special Condition 4C.. the maximum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3199) SD PAGE 1 OF 1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvilie, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBER002 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

NO DISCHARGE MONITORING PERIODYEARIMONTH DAY I I Y-A MONTH DAYFrom: 0 1 8 0 1 6 0 1 1 1 To:1 0 1 8 0 1 6 3 1 0Byron. IL 61010NOTE: Read instrctions fare completin his formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISSAMPLEMEASUREMENT (12)00400 1 0 0 PERMIT 6.0 9.0 SEEEFFLUENT GROSS VALUE REQUIREMENT

"_"_ .._._. _ MINIMUM ._MAXIMUM PERMITSOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (19)00530 1 0 0 PERMIT LBSDY 15.0 30.0 SEEEFFLUENT GROSS VALUE REQUIREMENT

-30 DAY AVG DAILY MAX MG/L PERMI GRABCHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19)01032 1 0 0 PERMIT -'- S/DY -0.1 02EFFLUENT GROSS VALUE REQUIREMENT

..

30 DAY AVG DAILY MAX MG/L DALY GRABCHROMIUM, TOTAL SAMPLE 3A VI X(AS CR) MEASUREMENT (26) (19)01034 1 0 0 PERMIT -. LBS/DY .1 2.0EFFLUENT GROSS VALUE REQUIREMENT

...._3 DAY AVGA DAILY GRABCOPPER, TOTAL SAMPLE 3D DAY (19)(AS CU) MEASUREMENT (26)01042 1 0 0 PERMIT 0.5 1.0EFFLUENT GROSS VALUE REQUIREMENT

-""I-DY -30 DAY AVG DALY GRABIRON. TOTAL SAMPLE 30 D AAY_(AS FE) MEASUREMENT

26) (19)01045 1 0 0 PERMIT LBSDY 1:0 1.0EFFLUENT GROSS VALUE REQUIREMENT

-30DAY AVG DAILY MAX MG/L DAILY GRABLEAD. TOTAL SAMPLE 30 DAAY(AS PB) MEASUREMENT (26) (19)01051 1 0 0 PERMIT 7 L 0.2LSD -- 0.4EFFLUENT GROSS VALUE REQUIREMENT

-._ 30_DAY AVG DAILY MAX MG/ DAILY GRABNAME/TnTLE I certify under penalty of law that this document and all attachmrents were prepared under myPRINCIPAL EXECUTIVE OFFICER direction or supervision in accordance with a system deskined to assure that quaizfied personn TELEPHONE DATEpropertty gater and evale the etonnation submitted.

Based on my inu of the person or persons.815 406-3700Bradley J. Adams who manage the system. or those persons directly responsibe for gatheding the information.

the 8154063700 08 07 18information submitted is. to the best of my knowledge and betlef. true, accurate.

and complete.

I ai SIGNATURE OF PRINCIPLE rPlant Manager aware that there are significard penalties ftr submiring falose information, Incuding the possiilbty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED OR PRINTED r-fre and imprisionment for knowing violations.

AUTHORIZED AGENT CODE NUMBER _________

COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. This discharge point was not used this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OFd2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDESDISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, 1160555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERF -002 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

. NO DISCHARGE MONITORING PERIODI YE MONTH DAY I YEAR MONTH DAYFrom:' 016810 1 6 011 I To: 01 8 0 1 6 3 I 0NOTE: Read instructions before coMatin" this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FSAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISNICKEL, TOTAL SAMPLE 26) 19)(AS NI) MEASUREMENT (26) (19)01067 1 0 0 PERMrr LBS/DY -1.0 2.0 MG/L DALY GRABEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY MAX MG___DAI

_ GRABZINC. TOTAL SAMPLE 26)19(AS ZN) MEASUREMENT-(26) (19)01092 1 0 0 PERMIT 1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT LBS/DY 30 DAY AVG DAILY MAX, MG/L DAILY GRABSAMPLE 26) 19)OIL AND GREASE MEASUREMENT (26) (19)03582 1 0 0 PERMIT LBS/DY 15.0 20.0 * .TWICE/EFFLUENT GROSS VALUE REQUIREMENT

-L 30 DAY AVG DAILY MAX MG/ GRABFLOW, IN CONDUIT OR SAMPLE 03)THRU TREATMENT PLANT MEASUREMENT (03)50050 1 0 0 PERMIT REPORT REPORT MGD TWICE/ TOTALJZ.EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILY-MAX M. -.-MONTHSAMPLEMEASUREMENT PERMIT"REQUIREMENT

..SAMPLEMEASUREMENT PERMITREQUIREMENT

.SAMPLEMEASUREMENT PERMIT -.REQUIREMENT

_ -_-. ._ ..,AINEWITLE I certify under penalty of law that this document and alt attacthments were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER udiaction or supervision in accowance with a system designed to assure that qua,-d personnel

_o__ __::_ _property gather and evalute the information submitted.

Based on my inquiry of the person -sor815 406-3700 08 071Bradley J. Adams who manage the system. or those persons diretly responsible for gathering the infornktion, the 08 07 18information submitted is. to the best of my knowledge and belief. tnie, acOurate.

and comet. e am SIGNAT OF PRINCIPLE Plant Manager aware that there are sigrncam penalties for submtting false infomaton.

including the poasiity of EXECUTIVE OFFICER OR AEA NUMBER YEAR MONTH DAYTYPED OR _ 'fie and i nm ent for kno -,g violatio.m AUTHORIZED AGENT CO DE MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE2 OF 2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 June 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)06/07/0806/14/0806/21/0806/28/0812012012012096.289.987.990.2Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of June 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byrch\byrondb\clerk\MonthlyDMR\attachO I \JuneOS ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 June 2008COMMENTS:

I. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 30 of 30 days.k:byrých\byrondb\clerk\MonthlyDMRWattachO I VuneWO EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing-Time (Minutes)

(Minutes)

U-1 U-2 U- I U-206/01/08 55 57 06/08/08 45 4506/02/08 55 5906/03/08 55 5506/04/08 42 4106/05/08 45 4206/06/08 55 5506/07/08 44 42----------HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 06/03/08Time: 10:46Analyzed by: T.M.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.040.50"!

i , .' ,0.46 !0.44 -110.42 -0.40 I __0.36 -~ ----o.32-i!0.30-0.28 -l j ' L 'C0.24 l-10.22 ' -' ' ; ' '0.18 -f-ji0.16 -i0.140.08 I [ _0.06 --~ ---- -f0.02 .I i L L W _I -0.00 -0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-206/09/08 50 5006/10/08 50 5006/1t/08 43 4306/12/08 42 4006/13/08 55 5506/14/08 50 5006/15/08 50 50-- -------- ----HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 06/09/08Time: 10:41Analyzed by: M.D.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.4850 ---,--~- I0.44 LI -0.42 -i- --- -- I03- ----8 --10:36 -0.340.28iE 0.26 [ -~ZI -ZI~I0220.2060.180.16 W0.08 _0.06 "0.04 210.00 .I '0255075Minutes100125150 EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-i U-_206/16/08 50 5006/17/08 51 6106/18/08 51 5706/19/08 51 5I06/20/08 50 5006/21/08 50 5006/22/08 50 50HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 06/16/08Time: 13:15Analyzed by: D.C.A.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.260.240.220.200.180.160.140.120.100.080.060.040.020.00J _ __-~ ~ I tt ___TtF I-.-~I ---- ~IZ[Z-~-1--' I -.i-~- .1.- -I~1 ___ .-'--~ izJz~.z~

I-i-. __ __-____ .....1...........

~ ..........

L -___ ____0255075Minutes100125150 0 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

(Mi tes)u- I U-2 U-I u-206/23/08 43 45 06/30/08 50 5506/24/08 44 4106/25/08 43 4006/26/08 51 5006/27/08 50 5006/28/08 50 5006/29/08 52 54HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 06/23/08Time: 09:17Analyzed by: M.W.H.Reviewed by: D.S.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.50 n,0.44 -' '- _i,0.42 -I I [ --I,0.40 .-i--I -r] -i -i , -0.38 ii 1 j j.' .,L0.32 -I I -'- I0.304 ,l --i-0.28 -' -4 I I , _ -o o I 4 I { 4EO0.26 ---CLC 0.24 -- -I i f II0.180.16 I -I -0.12 -0.04 I I I -I 10.02o -i i -, , _ I ' I0.00 L i .____ -L. I .. __H0255075Minutes100125150 Exelon Generatio, Corn pany. LLC www.exeloncorp.com NuclearByron Station4450 North German Church RoadByron, IL 61010-9794 August 21, 2008LTR: BYRON 2008-0084 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number1L0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report for* Byron Station, Units 1 and 2. This report covers the period July 1, 2008 through July 31, 2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley J AdamsPlant ManagerByron Nuclear Generating StationBJAIZC/sdk Attachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron Station NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERA01 0I DISCHARGE NUMBERMONITORING PERIODYEAR I.MONTH DAY I YEAR IMONTH D;YOCR0501MAJOR(SUSR 01)F- FINALDEMINERALIZER REGENERATE (001A)EFFLUENTI *

NO DISCHARGE From:l 0 1 8 I 0 1 7 1 0 1 1I To:l 0 1 8 1 0 1 7 1 3 11NOTE: Read instructions before comoletin tis form~~~~FREOUENY SMLQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FENCY SAMPLEPARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS YPESOLIDS. TOTAL SAMPLE0.8 0.8 19) 0 285 ECSUSPENDED MEASUREMENT (26)____.8_<_0.8_(19)_0_2_5_EC 00530 1 0 0 "PERMIT -15.0 .300 ONCE/.EFFLUENT GROSS VALUE REQURWEMENT 7 _ _._*_._ ,_. 30DAYAVG.

DAILY MAX MONTH _OMP-_CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT(19) 0001032 1 0 0 PERMIT- LBS/DY 0.1 02EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILYMAX MG/I DAILY GRABCHROMIUM.

TOTAL SAMPLE 00(AS CR) MEASUREMENT (26) (19)01034 1 0 0 *PERj .--.. ". 1.0 2.00103 1. 0 0 LBSIDY "DIL "A MG1L DAILY GRABEFFLUENT GROSS VALUE ,REQUIREMENT

---30 DAY AVG DAILYMA MCOPPER, TOTAL SAMPLE (26) (19) 5(AS CU) MEASUREMENT 01042 1 00 s PERMIT- LBS/DY 0.5 1MG/ DAILY GRABEFFLWENT GROSS VALUE -REQUIREMENT" 30 DAY AVG DAILYIMAX

" M1D__RIRON, TOTAL SAMPLE (26) 19) 500(AS FE) MEASUREMENT

_2___ _19)_50_01045 1 0 0 -PERMIT 1.0'1.0EFFLUENT GROSS VALUE REQUIREMENT LBS/DY -30DAY AVG DAILY"0A."

MG/I DAILY GRABLEAD, TOTAL SAMPLE(AS PB) MEASUREMENT 01051 1 0 0 " PERMIT Lamy 02 O .0.2 0.4EFFLUENT GROSS VALUE REQUIREMENT

-, L 30 DAY-AVG.

DAILY MAX MG/I DAILY GRABNICKEL.,

TOTAL SAMPLE(AS NI) MEASUREMENT

--901067 1 00 .PEMT 7 1.0 2.0EFFLUENT GROSS VALUE -REQUIREM.ENT

--LBS/. 30 DAY AVG DAILYMAy MG/L DAILY -GRABNMfTE I cedtiy tunder penalty of law that the documnwt arid all attlactlsme were prepared uinder TEEyON DATPRINCIPAL EXECUTIVE OFFICER directionor siu pWisi in accordance with a system designed to assue that tgua'-teed ersn 0 T DATEproperty gather and evalute the stt Based on my nqway of the person or persons 815 406-3700Bradle J. Adams who manae the system, of those persons recty responsee tor gao"tra the rAomation, the 1 08 21informnaton 5ibifted is, to the best of my knowlede and Delief, true, accurate.

and complete.

a SIGNATURE OF PRINCIPLEain Plant Manager aware that there am 59icam rfot&rdl"false inferm Ion, moludirg the poestd of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAY_____OR ____e and imprisonment for __ _ _ _a__ns. AUTHORIZED AGENT CODE YEAR MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Refernce all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed 23 of 31 days during this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT... NO DISCHARGE

[ "MONITORING PERIODM I MONTH DAY A I MONTHI DAYFrom: 0 181 17 00 1 7'ro0o1 0 1 0 1 713 1 1I I I q I I pMEASUREMENT PEOEANrIIIS I dI cattlly under penalty d law tris docmnent and alt attadnent weae prepared under myilirection or supervin m accoadance with a systenm designed to assure that qualified petsonnel proenly gat&e and vaute tMherinaormation submitted.

Based on my Mnquy of et peson or personswrho manage the system, or those persons diretly responible (or 9athaing the iormatio thenodmstion submtted is. to the best 01 my knowledge and beif,. uee, and copiete.

I amaware that there ae sigiticant penafies for wbTi talse xntding the posalbuity ofWe and imprionmtt foa rowIng voLjtions.

all attachments hare)

NATIONAL POLLUTA CHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0046313 PERMIT NUMBERB01 aDISCHARGE NUMBER00CR0501eMAJOR(SUOR 01)F -FINALSTP EFFLUENT (FORMER 001B)EFFLUENTNODISCHARGE EJI MONITORING PERIODIYEAR I MONTH I DAY I I YEAR I MONTH I DAY II I l ----; iFrom:I 0 1 8 I o07 1 0 1 -To:! 0 1 8 1 0 1 7 I 3 1 1 1I I E I: ý 8 1 G oli f_____________________

________________________________

IU! E; f'lUU 11101UULII;UIIO CII ull~J,, ItIllSlQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS OF TYPEAVEAG MAIU ANALYSIS

____BOD, 5-DAY SAMPLE(20DEG. C) MEASUREMENT

<0.12 <0.13 (26) -2.0 <2.0 (19) 290 DC00310 1 0 0 PERMIT -14.2 -.25= 30.0 60.0 MTWICE CEFFLUENT GROSS VALUE :EOUIREMENT.

30 DAY AVG DAIL. MAX LBS/DY 30DAYAVG 0DALY MAX MGIL MONTHPH SAMPLE 7.49 7.53 (12) 0 290 GRMEASUREMENT 7.49_7.53_(12)_290_GR 00400 1 0 0 PERMIT -6.0 -9.0 TWICE/ GRABEFFLUENT GROSS VALUE REQUIRE ENT --MINIMUM "_- MAXIMUM MONTHSSOLIDS, TOTAL SAMPLE __SUSPENDEDLMEASUEE 0.09 0.10 (26) 1.6 2.0 (19) 290 OCSUSPENDED MEASUREMENT 00530 1 0 0 APERYIT 14.2'.---

2A5 .3.0 M60 " TWICE/EFFLUENT GROSS VALUE REQUIREMENT:..

z30:DAY AVG .DALY MAX LBS/DY -30 DAY AVG D6LY.MAX MG/L MONTH COMP24.FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.006 0.011 (03) 0 135 CN50050 1 0 0 PEMIn REPORT -REPORT D .NT" .EFFLUENT GROSS VALUE REQUIREMENT 30 DAY"AVG .-DAILY MAX -MGD ---- DAILY CONTINSAMPLEMEASUREMENT

PEfMTW-RlEQUIREMENT-SAMPLEMEASUREMENT

___._--_,_.____-

.-,PERMIT-

._________

REQUIREMENT

_ _ _ _ _ _ _ _ _ _ __ _ _ _ _ __ _SAMPLEMEASUREMENT,

" pERMIT- -" -" " "' ..'--_ _ _ _ _ REQUIREMENT

.__ _ _ _...__ _-_._._ -_'.._ _ _ ' _ _ _.MIEASUREMENTý rIAMErnTLE I Cetify uSjft patalty, d law Mat tive doajmaid and all attachrrnerits were prepared Lindef my TEEHNEDTPRINCIPAL EXECUTIVE OFFICER direction or uVervon in accordance wit a system designed to mum ta qTEEP pONEDATproperty gather and evaAt the asubmitted.

Based on my buby of the person or persons "405-3700 Bradley J. Adams who manage me syStem, of mase perons directly msposble for gaMeing the irlomiatbon, me the _15_14C&3708508 08 21nfornrita,,

sutmitted is. to mae best of my ani MAW, true, acorate.

a ain Ia SIGNATURE OF PRINCIPLE Plant Manager aare Mat the are soigitcail penaties for suttfit ratisoenati.

mrEIdiaV ma t oa EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTmPED OR PFLnM rine and for Wnotg violations.

AUTHORIZED AGENT CODE NUMBER YE RON HACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reterence all attachments here)1. Flow exdsted through this oulail 29 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE I OF 1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfelld RoadWarrenvilie, IL 60555FACIUTY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERCo1 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENT.°NOOISCHARGE EJMONITORING PERIODYEAR IMONTH -DAY YEAR I MONTH DAYFrom: 01 8101 7101 1 I To:l 0 1 8 1 0 1 7 31 1 II I .. .....NOTE: Read instructions before completino this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX TYPEAVERAGE ANALYSISSOLIDS, TOTAL SAMPLE 26) < 6.4 172 19) 0 240 DCSUSPENDED MEASUREMENT 00530 1 0 0 ;-PERMI .. 15.0 30.0:EF05U0N1 0RS 0 U ERMN1 "LBS/DY 15.0 MG/L WEEKLY "OLMP24EFFLUENT GROSS VALUE EQUIREMENT

-30 DAY AVG DAILY MAXCHROMIUM, HEXAVALENT SAMPLE (AS CR) MEASUREMENT (26) -- (19) 50001032 1 00 PERMT -LBSIDY 0.1. 02EFFLUENT GROSS VALUE REQUIREMENT

..-. 30 DAY AVG DAILY.MAX MG/L DAILY GRABCHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT

-(26) (19) 50001034 1 0 0 PERMrr. ." -* 1.0 2.0EFFLUENT GROSS VALUE AREOUIREMENT

-.LBS/DY "A VIM MG/L DAILY GRABCOPPER, TOTAL SAMPLE(AS CU) MEASUREMENT (26) (19) 50001042 1 0 0 "'PERMIT

" 0.5 )EFFLUENT GROSS VALUE REQUIREMENT-LBS/DY -0AY AVG DAILY MAXIRON, TOTAL SAMPLE(AS FE) MEASUREMENT (26) -- (19) 50001045 1 00 PERMW. LBS/DY .1.0 1.0EFFLUENT GROSS VALUE REQUIREMENT 30 DAY.AVG -DAILY MAX ML_ _ GALEAD. TOTAL SAMPLE (650(AS PB) MEASUREMENT (26) -- (19) 50001051 1 0 0 .:":PER. 02MI-. ..4RE*RMN "--". -:.. LBS/DY "00

_- __GLDLY GRAEFFLUENT GROSS VALUE " _REQUIREMENT_

-. -... ...,- ,*,, 3 DAY AVG DAILY MAX MG/L DAILYNICKEL, TOTAL SAMPLE 219S(AS NI) MEASUREMENT (26) " (19) 50001067 1 00 -1.0 2-0EFFLUENT GROSS VALUE -REQUIREMENT W .BS/DY 30 DAY AVG DAILY MAX MG/L DALY GRAB* *-.. .- .-.NAMEMYTLE I certtfy wldaE penalty of law UWa this documnet and all aftlaclaft viwet prepared under My F "/ATPRINCIPAL EXECUTIVE OFFICER directon or supervison in accodance with a system desiged to assure that qualified personnel TELEPHONE

-propedy gather and evalute the information submitted.

Based on my hnqimy ot the person or personsBradley J. Adams who manage the system, or those persons directly respons or gathertng the inormnalon.

the 815 406-3700 08 08 21information submitted is. to the best of m knowledge and bebet. trne. accurate, and complete.

tIam SIGNATURE OF PRINCIPLE Plant Manager aware Mat there at. sigitfiant pe #otras to, submsdtg talsa rommamon incbdig the possil of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPE OR PROGEi in sionand t lot ow0e viglabtons.

I AUTHORIZED AGENT COD NUMBER YA MNH DCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this outtaD 18 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SOSD 1 OF 2vv 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 6055FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERCol 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENT"** NO DISCHARGE F-1 ...I MONITORING PERIODYEAR MONTH DAY I ARI MONTHI DAYFrom:1 0 I a I 0 17 1 0 11 To:l 0 1 8 1 0 1 7 1 3 11I I I I I I Ii l l I l I INOTE: Read instructions before comolefin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO.FREQUENCY PARAMETER AVRG AIU NT X OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISZINC. TOTAL SAMPLE(ASZN) MEASUREMENT (26) (19) 50001092 1 0 0 PERMIT --1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT,

-_ _, -,,LD__ : 0DAYAvG DAILY MAXGRABSAMPLEOILANDGREASE MEASUREMENT

26) <1.5 1.9 (19) 0 240 GR03582 1 00 PERMIT 15.0 2D.0EFFLUENT GROSS VALUE REQUIREMENT

-0LBSDY .DAY AVG DAILY MAX MG/t WEEKLY GRABFLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.030 0.053 (03) --- 0 135 TM50050 1 0 0 PERMIT REPORT REPORTEFFLUENT GROSS VALUE -REQUIREMENT 34 DAY AVG' DAILY MAX DDAILY TOTALIZ.SAMPLEMEASUREMENT PERMIT " '.-

-_. ." " * " , .... ....SAMPLEMEASUREMENT PERMITSAMPLEMEASUREMENT REQUIREMENT

-SAMPLEMEASUREMENT PERMIT .__ EU.ENN T _ .. _ _. .._ __PRINCIPAL EXlECULVOE OFRCER of supenvsion a=0nanc wir a system ones to assue to quaedLEPHONE DATEproperly gather and evalue the minformation submitted.

Based Tn my Entuay of te peron or pewsBradley J. Adams who manage the system. or thde peor, directly responsibe for gathenng the Informalten.

8 " SIG 08 08 21inormation submittled is. to the best d my knowIedge and belief, tu. craem .a o I SIGNATUR OF PRINCIPLE Plant Manager aware that iem are significant penaltiesf tr suttig talse atmiatinwi.

utcidg the posste d EXECUTIVE OFFICER OR AREA NUMBER YEAR'pEDO n pw I and luruner lot knowing violatias.AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERD01 0DISCHARGE NUMBEROCRO501MAJOR(SUOR 01)F- FINALRADWASTE TREATMENT (FORMER 001 D)EFFLUENT.. MNO DISCHARGEEJ I MONITORING PERIOD IYEAR I MONTH DAY I I YEAR I MONTH DAY IFrom:1 0 I 8 I 0 I7 1 0 1 1 I To:1 0 1 8 1 0 1 7 13 1 1 1I I I I I I *I I I I I l IByron, IL 61010NOTE: Read instructions before conIefin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS OF TYPESOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (26) 3.0 4.8 (19) 0 240 CP00530 1 0 0 PEIhtRr 15.0"30."LBGDL.-E-K-Y O5. 3.EFFLUENT GROSS VALUE REQUIREMENT "BS. 30.DAY AV .DAI5Y MAX MSAMPLEOIL AND GREASE MEASUREMENT (26) < 3.0 4.7 (19) 0 240 GR03582 1 0 0 PERM"IT -.15.0. .20.0EFFLUENT GROSS VALUE REQUIREMENT

......__ -... 30 DAY AVG DAILYMX MG/L WEEKLY GRABFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.025 0.045 (03) ...... 0 135 CN50050 1 0 0 ' PERMIT --0REPORT -REPORTEFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG AY.MGD'"

-. DAILY CONTINSAMPLEMEASUREMENT PERM1T "-REQUIREMENT.

SAMPLEMEASUREMENT PERMITREQUIREMENT

-."""SAMPLEMEASUREMENT P- RM. .-..- .______ _____ _____ REQUIREMENT*

......_ _ _ _ __ _ _ _ __ _ _ __ _ _ ___ _ _ _ _ _ _SAMPLEMEASUREMENT PERMIT .-.REQUIREMENT

--". ." '-____ ._._._,._,,_"_"_._""_"__

NAMFTLE Ictldy Wd penalty of law hat ths documen and all attacdt were prepared under my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER direction or supe,,ism m accodane with a system designed to assum that qualified personnel popeIy gather and evaite the meiormation su&nitted, Based on my mquiy of the person or personsBradley J. Adams Wo manage the system, or those persons directly resp for galterMg the inlfomton.

tne 21infonnalin subtretted is, to the best of my noAtedg and belief, true. accurate, and comlete.

I am SIGNATRE OF PRINCIPLE Plant Manager awar there are ignicant peries for hg flae infoomnatim, lnrcug the possft iaof EXECUTIVE OFFICER OR A NUMBER YEAR MONTH DAYtWho PAI ine and e for NTownD violatins.

AUTHORIZED AGENT YODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hem)1. Flow weisted through this oullatl 9 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGEIOF10P0 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEJADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010I IL0048313 PERMIT NUMBERE01 0I _DISCHARGE NUMBERF MONITORING PERIOD II YEAR I MONTH I DAY I I YEAR IMoNTH'I DAY IOCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001 E)STORMWATER NO DISCHARGE I I l lI

I .--I -'J" IFrom: 1 0 1 j~ 8 1 17 01-1I To:l 0 8 I 0 I 7 I3 1 1 1.....i WNOTE: Read instrctions betore comletno this formPARMEERQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH SAMPLEMEASUREMENT

_(_12) 50000400 1 00 0 PERMIT ---6.0 9.0 SU SEE GRABEFFLUENT GROSS VALUE REQUIREMENT

._-. -._. MINIMUM MAXIMUM PERMIT .SOUDS, TOTAL SAMPLE ()95SUSPENDED MEASUREMENT (26) (19) 50000530 1 0 0 PERMIT -B: " 15.0 30.0 SEEEFFLUENT GROSS VALUE REQUIREMENT

-.30 DAY AVG DAILY MAX PERMITCHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19) 50001032 1 0 -PERMIT.

LBS/DY -.1 02 MG/L DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT

-.: -30 DAY AVG ,.. DAILY MAXCHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (26) (19) 50001034 1 0 0 .PERMIT-..

1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT LBSD -30DYAG -IL;. MG/L DAILY GRAB* -.'.- -"30-DAY AVG. -DAILY MAXCOPPER, TOTAL SAMPLE (2_)(AS CU) MEASUREMENT (26) (19) 5W01042 1 0 0 *.-.PERMIT

" L,,D -

.- : ..01 42 00.PPL~r~*l5Dy

-0.5 10MG/L DAILY GRABEFFLUENT GROSS VALUE -REQUIREMENT

__ -"__-. 30DAY AVG DAILY MAX. ".___O __ GRA_IRON, TOTAL SAMPLE(AS FE) MEASUREMENT 19)01045 1 0 0 PERMIT 1.0. 1.0EFFLUENT GROSS VALUE RRE EMENT --30"DAY AVG DAILY " A MG/L DAILY GRABLEAD, TOTAL SAMPLE(AS PB) MEASUREMENT (26) (19) 50001051 1 0 0 PERMIT- .--.. " ".':"G-L DAILY0GR0.

EFFLUENT GROSS VALUE REQUIREMENT

--- .,, Y " 30 DAY AVG DAILY MAX MG/L_ DALY _GRABNAMEITITLE I certfy under -ea-Y of law that tn docume .nd all ai-ac-rien were prepared under my TELEPHONEDATE PRINCIPAL EXECUTIVE OFRCER direto Or supennion in accotdace wit a syste desind to a.ssure that qualfie peownnel EEPOEDTproperty gather and evafte the rdmnnaton n ed. Based on my iwx q at the parson or persons ___ 85 -Bradley J. Adams who manage he sye, or thwe person & msW lot t me Torma2on, te 815 406-3700 8 0T 21infrmaio submited is. to the best of my wanovg and b~elie, true. accurate, and compilet, lamn SIGNATURE OF PRINCIPLE Plant Manager aware tat ther are sigrticar penaltes for sulmitrng false incuding the pwoiy di EXECUTIVE OFFICER OR ARE NUMBER YEAR MOnTYMo OR PFUM -I fine and imopmnment lor knowing violations.

AUTHORIZED AGENT CODFACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through this ouffall 7 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERE01 0I _DISCHARGE NUMBERI MONITORING PERIODI YEAR I MONTH I DAY I I YEAR I MONTH I DAYOCR0501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORMWATER

.. NO DISCHARGE "1

I ; I --I] I -;- I -.From:[ 0 18 1 0 I 7 I 0I 1 I To:1 0 1 8 1 0 1 7 1 3 1 1iNOTE: Read instrctions before comolefino this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OF TYPEP M AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISNICKEL. TOTAL SAMPLE(AS NI) MEASUREMENT (26) (19) 50001067 1 0 0 -PERMIT 1.0 2.0EFFLUENT GROSS VALUE REQUIREMENT LBS/DY " 30 DAY AVG DAILY MAX MG/L DAILY GRAB.ZINC. TOTAL SAMPLE (26) (19) 50(AS ZN) MEASUREMENT

(_____19__

50001092 1 00 PERMIT" .0 2.0EFFLUENT GROSS VALUE "EQUIREM4ENT

-30 DAY AVG DAILY MAX MGJL DAILY GRABOIL AND GREASE SAMPLEMAUEET(26)

< 1.6 1.8 (19) 0 290 GROIL ANDGREASEMEASUREMENT_____

03582 1 0 0 PERMIT- LBS/DY 15. 20.0 MGL TWICE/ GRABEFFLUENT GROSS VALUE R EMENT- -DA- ""S/- DALYMAX MONTHC IFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 50060 1 0 0 PERMIT.-

REPORT REPORT- MGD --. TWICE/EFFLUENT GROSS VALUE REQUIREMENT X 30 DAY AVG -DAILY MAX. "___ -._ " *._"_._MONTH SAMPLEMEASUREMENT PERMIT. .-.._REQU5EMENT i.SAMPLEMEASUREMENT PERMIT ,.. ,'_'REQUIREMENT.

, ..SAMPLEMEASUREMENT PERMIT:-

--REQUIREMENT___.:._.-._

-, ... ..._.-NMnTE Iceomfy under penalty of law Miat NO documnert and an attacfmenla were prepared under my / -ITELEPHONE DATEPRINCIPAL EXECUtiVE OFFICER direction or supenmsion in accordance with a system designed to assure that qualified personrel propeuy gather and evate ame Basedn myin y oIfl thmepeon or eons 815 406-3700iBradeyJ suAm h mitaed is. to the best of my wnowledge and belief, tf.or accurate.

and complete.

I am SIGNATURE OF PRINCIPLE Plant Manager aware to there am penalties lot submating false Irnorynalion, bwludg the possil" of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYWIRED OR PFMNED fine and intpnislonment for knowing viatios.AUTHORIZED AGENTCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev W99) SD PAGE2OF2aI 0NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO601PERMFTTEE NAMEJADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenvi le, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBER001 0DISCHARGE NUMBERI MONITORING PERIODI YEAR MONTH I DAYT YEAR MONTH DAYFrom:1 0 1.8 0 1 7 1 0 1 1 I To:I 1 8 017 I 3 I 1 IMAJOR(SUBR 01)F -FINALCOOLING SYSTEM BLOWDOWNEFFLUENT."NO DISCHARGE

"hIATF= A.:tn,1 ine~tnJtinnq hnfnra -nnltff this formI ,I I I I I II I i I i e IQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH EASMLE 8.69 -8.97 ( 12) 0 240 GRMEASUREMENT

__________

____ ___00400 1 0 0 PERMIT 6,0 9.0 SU WEEKLY GRASEFFLUENT GROSS VALUE REQUIREMENT

_._.-- MINIMUM U MAXIMUMCOPPER. TOTAL SAMPLE (26) 0.014 (19) 240 GR(AS CU) MEASUREMENT 01042 1 0 0 PERMIT -BS/DY MG/I WEEKLY GRABEFFLUENT GROSS VALUE REQUIREMENT

..._"- .DAILY MAX. MWY RZINC, TOTAL SAMPLE (26) 0.07 (19) 0 240 GR(AS ZN) MEASUREMENT 0109 1 0 ER~T -LBS/DY -pV MG/L -WEEKL Y GRABEFFLUENT GROSS VALUE REQUIREMENT

.D,,LY MAOXIDANTS.

TOTAL SAMPLE (26) 19) 500RESIDUAL MEASUREMENT 34044 1 0 0 PERMIT .0.05EFFLUENT GROSS VALUE RIEQUIREMENT

.B/Y -- -DAILY ~AX GLWEKY GAFLOW. IN CONDUIT OR SAMPLE 22.71 31.31 03) 0 135 CNTHRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 -..PERMIT ". "EJP T REPORT"EFFLUENT GROSS VALUE REQUIREMENT

30 DAY AVG' DAILYMAX MGD .. .., -" DAILY CONTINCHLORINE.

TOTAL SAMPLE 2194RESIDUAL MEASUREMENT (26) 0.17 0.33 (19) 0 240 GR50060 1 0 0 -PERMIT'

--S02 0.5" "-'" .../ .:ABEFFLUENT GROSS VALUE REQUIREMENT 30 DAY'AVG DAILY MAX __WE__ .GRSAMPLE___

HYDRAZINE MEASRM)EN

26) (19) 500MEASUREMENT___________

_______________

_____81313 1 0 0 E LBY 0.1 DLY WHEN GRABEFFLUENT GROSS VALUE REQUIREMENT

_ DAILY MAX DISCHARGING

-NMrTE I certiy under penatty ot law #Wa thes document and alt attachmenls were prepared

'mder MY TELEPHONE DATEPRINCOPAL EXECUTIVE OFFICER drrectiln or superfiSho in accordance wlh a system desgnad to assure that peisonne8 4 0Ipmpeny gaver and eatute te*inrrenaton sulynrtted Baseannaw hqtxryofthe personorpermon 815 406-3700Bradley J. Adams wheo manae ft systenigm at iaerons dne r f gamenng t i .Um 08 08 21inornmation submitted I. to the bes ofmy lowknledge and beha, true. accurate.

and cornite.

I am SIGNATURE OF PRINCIPLE Plant Manager aware thaMa tre arm sgeimnant iem ta sutbnrtep tamiad.oana m Mt poaLsblay at EXECUTVE OFFMCER OR AREA NUMBER YEAR MONTH DAYTVM oF PFNED fm and o for kowing vians. AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attahments here)Per Special Condition 4C., the ma)imum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev W99) SD PAGE 1 OF1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenvitle, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 I PERMIT NUMBER002o0F DISCHARGE NUMBERI MONITORING PERIODI YEAR I MONTH I DAY I I YEAR I MONTW I DAY IOCRO501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER NO DISCHARGE I ' .I l -;-" I .IFrom: 1 0 1 8 I 0 1 7 1 0 1 1 1 To:l 0 1 8 I 0 1 7 1 3 I I INOTE: Read instructions before comoletin thisformQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

-.OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISPH SAMPLE 12)MEASUREMENT (12)00400 1 0 0 PERMIT " 6.0 9.0- SU SEE GRABEFFLUENT GROSS VALUE REQUIREMENT

-MINIMUM MAXIMUM _ PERMIT GRAB.SOLIDS. TOTAL SAMPLE (2)_9SUSPENDED MEASUREMENT (26) (19)00530 1 0 0 PERM1T "LBSDY " 15.0 30.0 SEE GRABEFFLUENT GROSS VALUE REQUIREMENT

-7. -30 DAY AVG DAILY MAX PERMITCHROMIUM, HEXAVALENT SAMPLE 26) (19_(AS CR) MEASUREMENT (26) (19)01032 1 0 0 -PERMIT ..:." 0.1 -.0201032. 1 LB3=AYAG DIL A MGJL DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT

-BS/DY .3DAY.G DAILYMAXCHROMIUM.

TOTAL SAMPLE 26) 19)(AS CR) MEASUREMENT (2_)_(19) 01034 1 0 0 .PERMIT LBS/DY 1.0 2.0- MG/L DAILY GRABEFFLUENT GROSS VALUE REQUIREMENT

-30DAY AVG DAILY MAXCOPPER. TOTAL SAMPLE 26)(AS CU) MEASUREMENT (26)_(19) 01042 1 0 0 :PERMIT --0.5 1.0EFFLUENT GROSS VALUE REQUIREMENT

-. _ * ' _ ."_._Y ." 30 !AY AVG DAILY MAXDALY GRABIRON, TOTAL SAMPLE 26)(AS FE) MEASUREMENT (26) (19)01045 1 0 0 PERMIT LBS/DY 1.0EFFLUENT GROSS VALUE REQUIREMENT"

-.-. .30 DAY AVG DAILY MAX MG/L DAILY GRABLEAD, TOTAL SAMPLE(AS PB) MEASUREMENT (2_) (19)01051 1 0 0 Pow..BSDY 0.2 0.4EFFLUENT GROSS VALUE REQUIPEMENT

-.30DAYAVGY.M DAILY GRABNAUEITITLE I cety undr penalty ofalw ths document and a atuachymesi were prepared under my TELEPHONE DA-PRINCIPAL EXECUTIVE OFFICER daction or supennslon I acoordance wth a system desgned to ra d quaied 8 46onnel 15E406E E DATE,propely gatherand evauete inonnamonsubmitted Ra~se an my inquiy of the person or person154s-3 Bradley J. Adams wh~o manage the or those persons directly reslpnsol~e for gathering the tnform~atx the 08 08 21finormaziatr subkad is. to th best gd my knowledge and beie., true. accurate, and compltee.

aIam SIGNATURE OF PRINCIPLE Plant Manager aware to there are significant penalties for suLbmting false informatimo, Inudng mne possibt di EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYT DOR eCneE and uTpraawtmet lot Mowing violations.

I AUTHORIZED AGENT Y A MCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hem)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. This discharge point was not used this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, H 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER002 0DISCHARGE NUMBER1 MONITORING PERIODYEAR MONTH I DAY I " YEAR I MONTH I DAY]OCRO501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER NO DISCHARGE

...From:I 0 1 8 1 0 1 7 L_ 0 11TO:j 1 0 18 L1 0I 7 1 31 1NOTE: Read instrctions before com, ein this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO FREQUENCY SAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX OF TYPEEXA ANALYSISNICKEL. TOTAL SAMPLE(AS NI) MEASUREMENT (26) _ _(19)01067 1 0 0 PERMIT " LBS/DY 1.0 2.0 DEFFLUENT GROSS VALUE REQUIREMENT

---30 DAY AVG DAILY MAX MG/L DAILY GRABZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT 19)10921 00 PERMIT .LBS/DY 1.0 2.0DAILY GRABEFFLUENT GROSS VALUE ..REQUIREMENT

" : " -."30 DAY AV.G. DAILY.MAX MG/_ DALY .GRA_.OIL AND GREASE SAMPLE2)19 MEASUREMENT (26) (19)03582 1 0 0 pE'" rr " .15.0 20.0 .TWICE' GEFFLUENT GROSS VALUE REQUIREMENT

-L"" ..Y .30 DAY AVG DAILY.MAX:

MONTHFLOW. IN CONDUIT OR SAMPLE ,3THRU TREATMENT PLANT MEASUREMENT

-03)50050 1 0 0 PERMIT .REPORT. REPORT Mao TWICE/EFFLUENT GROSS VALUE REQUIREMENT 30 DAY AVG DAILYMAX-M MONTH TOTAIZ.SAMPLEMEASUREMENT

".PERMIT.

_ REQUIREMENT

._.___.,._._

SAMPLEMEASUREMENT

P E R M I T .... -REQUIR, EMENT. ....- .__ __ _ *___ _ _ .__ _ _ _ ._ _ _ __ _ __.._ _ _ _ _SAMPLEMEASUREMENT REQUIREMENT r-_ _NAME(T1TLE certify under penalty oi law that this document and all attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECUI1VE OFFICER direcion or supervisn in accordance with a system designed to assure that qualified personnel ppery gather and evalute the infrmation subnottd Based an my inquiry at te person or persons 850-30Bradley J. Adams wto manage the system or t persons directly responsible fr gatheri the Inormati he .f15406-3700 08 08 21inlfomation Rumitted Is. to the best of my knoWwedge and b"ee,. accurate, and cOmplete.

I an SIGNATUR OF PRINCIPLEa Plant Manager aware that themreO sIgnifIcant penalties lot submn false btionfmation ircludiV the possitty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYrWESD cm PR;-w ý "nae and impislonment for knowing violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachtents hem)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 July 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)07/06/0807/12/0807/19/0807/26/0812012012012093.191.292.591.3Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of July 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byfr-ch\byrondb~clerk\Month~yDMvR\attachO I VuIlJ8 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 July 2008COMMENTS:

I. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.k:byrý-ch\bymndb~cerk\MonthdyDMR~attachOI\JuiyO8 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U U-207/01/08 45 4507/02/08 53 5107/03/08 50 4807/04/08 50 4707/05/08 48 5007/06/08 50 470HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 07/01/08Time: 10:35Analyzed by: M.D.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.E0.0k.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00-E -t I+/- $I_ +/-t I zi; I0255075Minutes1001251500 EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-_I,_ U U-207/07/08 55 5407/08/08 51 5007/09/08 55 5507/10/08 55 5407/11/08 55 5407/12/08 55 5507/13/08 54 47HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 07/07/08Time: 10:50Analyzed by: G.S.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.EC.C.0.500.440.420.360.340.320.240.220.200.140.120.100.08066a0: 00.00~*1~-4--4----- I--4-* I I Jf --r-f--~ LLt-IF -...............

-JI f01--1 f 11 1 11:111251500255075Minutes100 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes) u___ I U-207/14/08 60 6007/15/08 50 6007/16/08 52 6007/17/08 66 6007/18/08 60 5007/19/08 62 6107/20/08 60 60HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 07/16/08Time: 11:56Analyzed by: M.D.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.E0.0..2if.. = rzrr -z zi: rn1-JLIZ jtZZ ZiLT_ _ _ izilzl~ILLIWJ~LJ~

---II r-4-_ ij If i LI0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

_-__U-1 U-207/21/08 57 5507/22/08 54 5207/23/08 60 6007/24/08 63 6407/25/08 60 6007/26/08 62 6307/27/08 57 52HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 07/21/08Time: 12:3 iAnalyzed by: S.C.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.4800.46 -------------------------

0.44 -j>* ------0.42 -J0.40 -0.360.320.30E 0.26 -0.2480.22 -i K0.200.180.14 i0.120.100.060.02o0o.00 , I J0255075Minutes100125150 6EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes) u-_._I U-2_07/28/08 49 5107/29/08 54 5107/30/08 53 5307/31/08 57 60HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 07/28/08Time: 11:41Analyzed by: D.C.A.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.Ea.0.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00025 50 75 100 125Minutes150 Exelkn.Exelon Generation

Company, LLC www.exeloncorp.com NuclearByron Station4450 North German Church RoadByron, IL 61010-9794 September 16, 2008LTR: BYRON 2008-0098 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit NumberIL0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units 1 and 2. This report covers the period August 1, 2008 through August 31,2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully,

!BradlefJ.

A~damsPlant ManagerByron Nuclear Generating StationBJA/ZC/sdk Attachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvilta, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 610101L0048313 PERMIT NUMBERA01 0I -DISCHARGE NUMBER, ,MONITORING PERIODYEAR I MONTHI DAY I I YEAR I MONTH I DAYIOCR0501MAJOR(SUOR 01)F- FINALDEMINERALIZER REGENERATE (001A)EFFLUENTNO DISCHARGE l

l .l .Il ."= I .l .' IFrom:1 0 I 8 I 0 I 8 I 0I I To:l 0 1 8 1 0 1 8 1 3 1 1NOTE: Read instructions fore comletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

_____ OFP T AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPESOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (26) 1.4 1.4 (19) 0 285 EC00530EO 1 0 0 ,_ -.10 -f%.~30' (M .5NE/',EFFLUENT GROSS VALUE -POIB~(~'

.-3 A MG/I -MNCHROMIUM, HEXAVALENT SAMPLE2)(19) 500(AS CR) MEASUREMENT2) 9So01032 1 0 0 -."-".--- -- ",, -.. -.EFFLUENT GROSS VALUE ..-GyN, LB/D j ,0*4 ...... 0-,.*-, ..CHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT (26) (19) 5000104 1 0 0 o ..,,...-r ... ;.., A'- :: -EFFLUENT GROSS VALUE CU=t " ..' 3=V, MG/GCOPPER, TOTAL SAMPLE(AS CU) MEASUREMENT (26) -(19) 500014 1t 0 t 0- r --0104.. .. UBDY 3.:.....

.1 ., .0 :.' '_.-_' MG/iL 5"*-""LY ~ GEFFLUENT GROSS VALUE " !RE<.NREME'T.

-. , ., VGDA._Y..M AX. ',IRON, TOTAL SAMPLE(AS FE) MEASUREMENT

--(26) (19) 500015100 ~ E-rT9- L B'- -<f04 '-S MG/I.EFFLUENT GROSS VALUE ...... ET'-"-.....3 A AV. * .. D,,LEADL TOTAL SAMPLE(AS PN) MEASUREMENT (26) (19) 50001067 1 0 0 PERlkft5--*

`zl 20 iEFFLUENT GROSS VALUE tr=OI -ET LBSID Y-

-,-.t...NICKEL, TOTAL SAMPLE(AS NJ) MEASUREMENT2)1950 EFFLUENT GROSS VALUE NT 8RA,.,..

B.

14AdEIMLlE I aerity under pentafty di Law tha on documngtt arid al adalacinents were Prepared under my ITLPOEDTPRINCIPAL EXECUITVE OFFICER dirctio or supeinsm in accordance wit a system designed to assure that qualified peiosnnet TELEPj, DA1PiMPt gaer and evalute theionformsain submitted.

Based on miy arquiry of the person or persons 815 406-3700Bradwhy J. Adams wto manage te syst- or fts persons drectlt MsPwmgst for gatheng the Iformaton.

the 08 09 16,itomstmn srnitted is, to the btestoL my WMWae, ege true, accura.,

sand copr , I tam SIGNATURE OF PRINCIPLE Plant Manager aware that ther are signiat Pena for submbn talse fomiaum.

Including Me poasielty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYWPM -na and inpsionment (r Iuoen Vwoajons.I AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (RePmence all attachments hem)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed 20 of 31 days during this month.EPA Form 3320-1 (Rev 3/99) SD PAGE I OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (OMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F- FINALDEMINERALZER REGENERATE (001A)EFFLUENTNODISCHARGE

[ MONITORING PERIODI YEAR I MONTH DAY I YEAR I MONTH I DAYFrom:l 0 I 8 1 0 18 1 0 11 O:l 0 1 8 0 1 38 11l l I l l l II l I I I I lNOTE: Read instructions before comDletnc this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FRQUENCY SAMPLEPARAMETER OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC, TOTAL SAMPLE 2)95(AS ZN) MEASUREMENT (26) (19) 50001092 1 0 0 7--ý-PEsRMIT--14 2 EFFLUENTOGROSS VALUE __________

r ~ --D2 P M/L AIL01092EN 1RS AU 0 .;RE:-REM"T

......_ _BS__Y

_

DAIL".

M_-._- ____"__..

":DIL..:" FLOW. IN CONDUIT OR SAMPL.E 0.012 0.076 03 0 135 CNTHRU TREATMENT PLANT MEASUREMENT 0.1007 (3) -0!0'REP R RER~T50050 1...~ ~MGD -EFFLUENT GROSS VALUE -4WOUIS ET~ 4%YAV VALMX ___.. .ALY ~ OTNSAMPLEMEASUREMENT

____________

__________

SAMPLEMEASUREMENT

_____ _____ _____..... .... ..... .-...... .....~ C *- ;.****C " -,J"_". * -% d ..~ .,*FLOW IN ONDUT ORSAMPLETHU RATEN LAT MEASUREMENT 0.012___

0.0_____

( _3) _--0_13_C SAMPLEMEASUREMENT

___'__-.-,_...___

_- .,..SAMPLEMEASUREMENT

..............-.........

...

.........

SAMPLEMEASUREMEN PEMT T-- -.MREASUREMENT NAMEMITrLE I certify under penalty of Iaw Mtat this document and anl anactiments were prepared under my A iPRINCPAL EXECUTIVE OFIRICER djrection of supenveton In accordance with a system designed to assur tMat quaified personnel TELEPHONE

_ DATEProperty 9a0me and evaluta Ui1m inonmtiaon stitd.Bedon my vxur atr maso orEP N persTHoDA inormation subimitted is. to th eto ykoldeadbhl tuacrtadcmlt.Ia SIGNATUR OF PRINCIPLE JPlant Manager jaware mhat there are aignifiant penalties fog subi51lktg false inlomiation.

Indutling the possailay dt EXECUTIVE OFFICER OR AREA NME ER MTYID RPRME and iniplskrifflerf for knowing viators AUTHORIZED AGENT NUMBE YEAR_ MONTH DAYCOMMENTS AND EXPLANA710N OF ANY VIOLATIONS (Reference all attachmients he,)EPA Form 3320-1 (Rev 3W99) sD PAGE 2OF 24Pa'-wp NATIONAL POLLUTA SCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60655FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERB1D 0--DISCHARGE NUMBERI MONITORING PERIODI YEAR MONTH DAY AI I MONTHI DAYFrom:1 0 I I 0 I 8 I 0 I 1 I To:. 0 I 1 0 I a I 3 I 1OCR0501MAJOR(SUBR 01)F -FINALSTP EFFLUENT (FORMER 0015)EFFLUENT.*NODISCHARGE

-!I I I l I I II I I l I I INOTE: Read instructions before comoletin this formIFREQUENCY SMLQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FSAMPLEPARAMETER

_____ ____ ___N. OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEBOD. 5-DAY SAMPLE<20

<2.0 (19) 0 290 DC(20 DEG. C) MEASUREMENT

< 0.14 <162<.99_

DC00310 1 0 0 '' ': : 2&5"'+.-;

. " --...Lamy ..--.60.0+MOI

-""COM"24" EFFLUENT GROSS VALUE

-. 11-3O1DAY.'AG`G k .LMAX -"= LA X30- " DAYAV " A 60O0- ___....PH -ESAMPEN 7.42 7.49 (12) 0 290 GR00400 1 0 0 ,: ...........

/ .......M IT:.: '.i .,- .. .. ... .... .. .. ......EFFLUENT GROSS VALUE 4REQUIREMENT'.

-4.. .-j -.- GA

, --SOUDS, TOTAL SAMPLESUSPENDED MEASUREMENT 0.06 0.06 (26) 0.9 1.0 (19) 0 290 DC00530 1 0 0 PER Y " " .... ...., 60:0 .-'.' 'C 0.EFFLUENT GROSS VALUE -URz

.DM.MAXY

.30.A.A DA.4XOMILMOTH"

.;.+-..+!,t.-EP..,=,,'0"

,:+, -V:.. .... .+.FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.006 0010 03) 050050 1 0 0 EzT.EO~~

7 GD -r--..1z

-EFFLUENT GROSS VALUE :RE0U I FEM"Ni .. ...-DM Y.]MA MG , .._- E .f " " -"- __-" _-.. .SAMPLEMEASUREMENT N,7-PERMIIVZ

-- =;_7' ..F~ ~~~ --~~' ~ ~__________....__,-... +,3,-~ ....... ...7 ..:L *SAMPLEMEASUREMENT SAMPLE A-.NAETE I ceandy under penalty of taw rhat this doounent and all attsachmuss were prepared uider myii TLPOEDEPRPNCIPAL EXECUTIVE OFFICER direi or supervi in accordance with a system designed to assure that quatteed persorenel TEpropelty gate and evatate the Inoation wAmed. Base on my iqay of the personopess"-i'815 406-3700Bradley J. Adam who manage the system, o thoSe peSoM directl rSpnsBe for gathering the itormatin the 08 09 16Wormation sulamittel ise to the best at my Iwotege and betief. true. acourate, and Iam SIGNATUfE OF PRINCIPLE Plant Manager awairethatthereant(ofkaingpnatesforsaideninlsonalon.

bnthepoiof EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYlwe- oI -tnn .I AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. Flow existed through this outfall 29 of 31 days during the month.EPA Form 3320-1 (Rev 3199) SD PAGE I OF 1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010110048313 PERMIT NUMBERColl 0DISCHARGE NUMBEROCRO501MAJOR(SUER 01)F -FINALWWTP (FORMER ODIC)EFFLUENT...NO DISCHARGE I MONITORING PERIOD IYEAR MONTH I DAY j I YEAR MONTHI DAYFrom:l 0 I 8 I 0 I8 1 0 1 11 TO:l 0 1 8 1 0 1 8 1 3 11I I I I I I II I I I I I !NOTE: Read instructions fore completi this fomQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOUDS, TOTAL SAMPLESUSPENDED MEASUREMENT

26) 4.6 8.7 (19) 0 240 DC00530 1 0 0 -0. -" .". L5IL -E F F L U E N T G R O S S V A L U E -RE O U N.EM --.........-, -..,0- --.1 G"-. , D A I L Y * ---- ...C. .PCHROMIUM, HEXAVALENT SAMPLE (26) S(5(AS CR) MEASUREMENT

(__) _(19)_500 01032 1 0 0 .E: ':LSDY M.G O1/ -.0.2 .EFFLUENT GROSS VALUE WREUIRBJE

-EýNT-.ý_____

0DYAG DL A~-M/ AL~- GAC"HROMIUM, TOTAL SAMPLE 2)(9 500(AS CR) MEASUREMENT (19)01034 1 0 0 ;7,77 ~.0- .7 AL GAEFFLUENT GROSS VALUE -- ..' .Y" ..30:DAY i 'DAIL'MAX:..-VD l". ..-..'-,COPPER. TOTAL SAMPLE(AS CU) MEASUREMENT (26) (19) S0001042 1 0 0 fl'j- -.->..0.5 ....MG.L....

DAILYEFFLUENT GROSS VALUE ,,REOU R M T ,. , ." GGRAB,_IRON, TOTAL SAMPLE(AS FE) MEASUREMENT (26) (19) 50001045 1 0 0 -PRMT.ýEFFLUENT GROSS VALUE

,._ .BS/DY .4..-' 10-3D1 0 , MG/LLEAD, TOTAL SAMPLE(AS PB) MEASUREMENT (26) (19) 50001051 1 0 0 RER -' -,-' " ... ."EFFLUENT GROSS VALUE U -'* "" ..i' -

LBS/DY "-'1.o7-,

.........DLY GNICKEL, TOTAL SAMPLE(AS NI) MEASUREMENT (26) _ _(19) 50001067 1 0 0 ..- Ic "1.r9 ' LBS.DY = .2.0 ... G.L :-REFFLUENT GROSS VALUE LB-'REQURMN

"________

",--"_"___

______""......

' _-_NAMErILE I Cary under penay law 011 this document and all atachments were prepared under my TELEPHONE PRINCIPAL EXECUTIVE OFFICER mir sLpervision in accordance wire a system desinied to assue t uaimei peDonneATE BIrdeezJy Aather and evah"lu the informaton submWAed.

Based on my iquiry at me perot or per4ons06-37 who manage the o perns di /rectlyMs for gathein me oitradon.

the 815 406-3700 08 09 16nomem submited is. to te best of MY knowledge and b". true, accurate.

and complete.

I am SIGNAJRE OF PRINCIPLE Plant Manager aware that themere siam scart pen foresto " fst seiinformation

.Iraing the possiblioy of EXECUTIVE OFFICER OR A NUMBER YEAR MONTH DAYTWPMO OFt ,,.nr ine and fioiment for Wnowing viWadcmi.

AUTHORIZED AGENT N B,.TECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reftnoane all attachments hem)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this outfall 18 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2wWW NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCR0501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvile, IL 6055FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERCol 0DISCHARGE NUMBERMAJOR(SUIR 01)F -FINALWWTP (FORMER GOIC)EFFLUENTIMONITORING PERIOD1~ I1YEAR MONTHDAY I I YEAR I MONTH IDAY I-lFrom: 1 0 I 8 I 0 I 8 Ioil IT1:I 01810181311I

*

NO DISCHARGE FJ ...I I I i I l IByron, IL 61010_NOTE: Read instructions before comletina this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19) 500EFFLUENT GROSS VALUE .......--.

-LBS/DY v .10--20 _ .-".G,01092EN 1 0R S 0 A UE P, EJ LIE TN ' L ""'. ..-,30 _D

-.

.- .,: ..OIL AND GREASE SAMPLEMEASUREMENT 1(26) < 1.7 2 (19) _0 .240 GR03582 1 0 0 *~~ ,. .-~~~-" GI -EKY- RBEFFLUENT GROSS VALUE AI-EMEN -" ___D '-_.. ,"r'.'-:

.;-:DAYAV" DAY X "__ -_.-_____K_.

_.- __-_FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.031 0.048 (03) 0 135 TM50050 10 0 ip-uiT'E; 4§ T--R-pogEFFLUENT GROSS VALUE A-SAMPLEMEASUREMENT

.__.___T___ii

--iOIRME , .~& ~SAMPLEMEASUREMENT

__--..__._._-.___._.____-

..-___,._-_,--._____-__-.,._,. ,- -. ... ....F.F71--mi Ar.- ,7..___________REOIJIREMENT 9 o'ay ' 4..______

_______________

SAMPLEMEASUREMENT i--. , V -

... .... ... ... ... ..~. *_ _.__ _ _ _" -=-- ':--: " .- '... .: .._.... .._ _ _ __... .._,. -_ _ _ __.-_;_._

__"_ -_'_"" "_..."_"

_-____________

5-_____________

. -: .'.5:SAMPLEMEASUREMENT

__._.___._._'________-._._-._:__-_-__..,

......:..

._ _ _ _ _ _ _ _ _ _ _ _ .... _ _ _ __... ....." _ _ _-_*_"_ '- '.'° ..._ .. ; ,. ..;, : ...; ,PR NCI A u E]E TTlrE OFIER ocnriy under penally of law that thes document and as attachmnents wore prepar-ed trader my T EL P O ED TBradley J.Adams whom anage the S )ltn fio r th pomona dsystem roposigneto forssuwigre tla tp e _ _ __ _ __ _ __ _ 1 0630propenty gamer and evalute the unfonnatrn subnutted.

Basedl on my rinqu.y of the person or persons ______________

snfonnattn sruatnined

b. to the trea ot my truteg and belief, true. accurate.

end c..siptee.

I am SIGNATURE OF PRINCIPLE 1Plant Manager awarethat t~ereare signiflcant penalies fr subnitisigfame inoimnatton.

biCUIng the posaibti EXECUTIVE OFFICER OR &REA NUMBER YEAR MONTH DAYRPm r ipstn emfr no joai .AUTHORIZED AGE NT ICODE_ _ _ _ _ _ _ _COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Retsrence all attachments her,)EPA Form 3320-1 (Rev 3/99) SD PAGE 2OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenviUe, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER-)D01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 0010)EFFLUENT* *NO DISCHARGE

-- *[MONITORING PERIODYEAR I MONTH I DAY I I YEAR I MONTH I DAYI. -. I -I

l .l , IFrom:I 0 I 8 I 0 I 8 I 0 I 1 To:l 0 I 8 I 0 I 8 I 3 I 1 1ALYL NOTE: Readinstructns fore co Uleien this rotoQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLUDS, TOTAL SAMPLE 26) <20 38 19) 0 240 CPSUSPENDED MEASUREMENT

()<.3(1 02C0 0 5 3 0 1 0 0 : .5 0 --B, .D.. ...... ......EFFLUENT GROSS VALUE E... L_0__ '-r:' '.-,AYAVG MG/I -WOI N RAESAMPLE

____ ___ILAND GREASE MEASUREMENT (26) <2.9 4.5 (19) 0 240 GR03582 1 0 0 LBS/DY .10 ,-. MY.EFFLUENT GROSS VALUE ý-REOI"LEMENTf MC-4 "a MG-L " V. DIY-MAXFLOW, IN CONDUIT OR SAMPLE 02 0 135 CNTHRU TREATMENT PLANT MEASUREMENT 0RPR 42'..REPORT IT50050 1 0 0

..-.... DAILY...

.T..EFFLUENT GROSS VALUE GREWIREMENTf;

-L3D.DLYYM.X

______ _________

,. .- ",-. ; _"SAMPLEMEASUREMENT SAMPLEMEASUREMENT SAMPLEMEASUREMENT SAMPLEMEASUREMENT£4 ...... ...-"- " -::... ..." ... .... ...____ __ _.....E0 mE ENT :, _ _. _ .-:'_!÷.-o....

,+. 'k.. .. ... ' : -..." ..... .... ~~~~~ ~~~~~~~. ..., .. ..- ... ... .... .-. : ..o ...: .:' : ...: .-NAMEJTITLE I cetiy under penalty of law that this document and all attachments were prepared under my TELEPHONE DATEPRINCIPAL EXECU'nVE OFFICER diecimor s4i in acrame with a system TELesiPH to Oaur NEa quabied persDAneE property gather and evalute the iWfoaon submitted.

Based on m quy of tohpeson or persons 815 406-3700Bradley J. Adams who manage the system. or thoe persons 4reCly rsponible for gathering the informaton.

the 08 09 16inforniaton submiited is. to the best of my knowldg arid belst, tree. aoourate.

arid complete.

lain SIGAUEO PRINCIPLE Plant Manager aware ta there aroe awg t penalties for submitting false tcfdN the possibty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTWED OR m line and Imprisonment for knowing violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hem)1. Flow e)dsted through this outfall 9 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE1OFIJp.WW 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMIT'EE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERE01 0I DISCHARGE NUMBERMONITORING PERIODI YEAR I MONTH I DAY I I YEAR I MONTH I DAYOCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORMWATER

... NO DISCHARGE ED ..I -- I -- I -- -IFrom:I1 0 1 8 1 0 1 8 1 0 j 1l To. I 0 1 8 1 0 1 8 1 3 1NOTE: Read instructions before completin this formPARAMETER QUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEOF TYPE...._AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS Ex ANALYSISPH SAMPLEMEASUREMENT (12) 50000400 10 0 jRI~ ' -- ~- '9:0 SIEE'EFFLUENT GROSS VALUE

...-... ..-

-:.. P7,.. ..SOLIDS. TOTAL SAMPLESUSPENDED MEASUREMENT.,

(26) (19) 50000530 1 0 0 A" " ...... "1"- ...0.. ..EFFLUENT GROSS VALUE 'E i -N .-L,,.; ..,A..,DILA..

MG/L .PEMI,-.,

CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT

-* (26) -(19) 50001032 1 0 0

..........

--...... M ...EFFLUENT GROSS VALUE ". REf OiUm.: .."- ....- r 30 DA, : ",D L M X'. 'A&.. .,.DA Y. .. ACHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (26) ( 19) 50001034 1 0 0 :,- 7PERM r(.e3 0*.. D-. .' ,-"',:..

A ..Y>.. .. .EFFLUENT GROSS VALUE 3.REO.I--"E-

-. , Y'-. 30AXYAVG:s

.D.I. Y. MGL. -COPPER. TOTAL SAMPLE(AS CU) MEASUREMENT (26) -- (19) 50001042 1 0 0 V L,-/Y .: G/L".' '= ",": .A.L:r'-

.-GRA.,EFFLUENT GROSS VALUE BEOIREMENj

... ..2- LBK) .,..3LQY-VG i DAILYMAX M___ ::,.'-IRON. TOTAL SAMPLE(AS FE) MEASUREMENT (26) (19) 50001045 1 0 0 LB/D e ' '- IEFFLUENT GROSS VALUE DA--IL'Y-LB/D .':-..1o I,ý, .'.. .. __":..LEAD, TOTAL SAMPLE ' ' .'(AS PB) MEASUREMENT 1 (26) (19) 5000 1 0 5 1 1 0 0 *- ..,RrT --, , =o. ;.. ..EFFLUENT GROSS VALUE -.1 .......DY .M./L D..NAEIITE I C8114 under penalty Wt law 0-tha isa docwtowt and aul atlachmefti were prepa redwier My TEEHNEDTPRINCIPAL

& W S i a w a W te, TELEPHONE DATEBrpa dey and ief ma Subtitdted.

Based an my oquxiy d te persmc o pe40 01sBradley J. Adams who ma-9ge e sysem. Or 0-ce peMons direcly resportibe for gatohtng the iwriWe 815 40-3700 "8 09 16in10natan su3nitted is, to the best ofmy Imetege and bealet, true. accuae. and complete.

I am SIGNATURE OF PRINCIPLE Plant Manager aware that iee are signfcant Penalte 10f subllIelng false inomtaIonL mOdjdAm the pwtsbfity al EXECUTIVE OFFICER OR AREATYM OR PR~rB limearimawerata mviorts.

AUTHORand nAGEiNT CODe NUMBER YEAR Mn0NTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hers)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through this outfall 4 of 31 days during the month.EPA Form 3320-1 (Rev 3199) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenvitle, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERE01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001 E)STORMWATER

.." NO DISCHARGE

[: "I MONITORING PERIOD IYEAR I MONTH I DAY I I YEARI MONTH I DAY IFrom:I 0 1 8 1 0 18 1o I 1 I To:: I ] 0 I 0 I3 1 1 1I I I I I l II I I I I I INOTE: Read instructions before comroetin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO.FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISNICKEL, TOTAL SAMPLE (19) 500(AS NI) MEASUREMENT (26) --01067 1 0 0 ..-..v -.---... -' 4.EFFLUENT GROSS VALUE " .- ,,DY -'3ODAY.AVG

.DILY..MAX.-'

MG. -.; DAIL,. .,t , .G..,ZINC, TOTAL SAMPLE (26) 19) 500(AS ZN) MEASUREMENT (26) (501092 1 0 0 -.ýi.ERMn-17.17-PrrJ"~

~ .~~EFFLUENT GROSS VALUE -." " 20 .... -'. 3 .0 -, ?-DAILY AAA.. .MG/'. *.0..2 "-..:.'"".

"'SAMPLE_OIL AND GREASE MEASUREMENT

( 26) < 1.4 1.5 (19) 0 290 GR03582 1 0 0 E T .-; ..- .150.. "..' ... .... T I .....EFFLUENT GROSS VALUE

' ... :,-. LBS/DY A "0DAYAYG.

&DA1LYM.),;

MG/L ' " O, ;. "__.__.FLOW, IN CONDUIT OR SAMPLE 0.32THRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 iSýQERMRt3-6

-- ".EPORTt"

-r- .... .- ..'; ' C": " :UEFFLUENT GROSS VALUE ,..P, MOD 7 t.. ' MO NAh ;-.. *, .-SAMPLEMEASUREMENT

"_._EQU A"~ xiE _Q_ _a___ ., r ..SAMPLEMEASUREMENT SAMPLEMEASUREMENT NAMEn~rmE I drY winder PenaflY of law theat ls documnter and an ale0lachne were ptrepad under rny I~ EEHNPRINCIPAL EXECUlnVE OFFICER direction or supelvion in accordance wih a system desqgned to assure Mat qualified personnel DATEroperlY gather and evalute the ffomation suwnilted.

Based on mnry lup of the person or persomal_

_,___ 815 406-3700Bradley J. Adams who manage the sysemi of those persos diecl rsponsfte for ga=M nog mnnmi the SINTR FPICPE08 09 16information smonvitted is. to the Iest ow my Wowledge and belef, trem. ac -raw.e, and cotplete.

lam SIGNAinE OF P l 11.1 11_1_1_1_

Plant Manager aware that there are sgn-panRises for false Worifatim.

rdkg the posusuy of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYoP O line and iSpusivnm for bno"win violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)rEPA Form 3320-1 (Rev 3199) SD PAGE 2 OF 2ALW 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)00CR0501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010[ IL0048313 I I001 0I PERMIT NUMBERDISCHARGE NUMBER lMONITORING PERIODYEAR IMONTH DAY YEAR MONTH IDAYFrom: 0 1 8 1 0 1 0 1 1 0 To:l 0 1 81 0 18 13 11MAJOR(SUBR 01)F- FINALCOOLING SYSTEM BLOWDOWNEFFLUENT*NODISCHARGE NOTE: Read instructions fore completing this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

)~OF AMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEPH SAMPLEMEASUREMENT

-865 (12) 0 240 GR00400 1 0 0 :" l.'...'.-,

.-" ." 4 -..2 t .....EFFLUENT GROSS VALUE ..-EUIEG MAXIMU";.M,

.SU -WEEI(LY.'

GRAB:"kCOPPER, TOTAL SAMPLE(AS CU) MEASUREMENT (26) 0.013 (19) 0 240 GR01042 1 0 0 ..' --7 .~V .75;1_________

_______ ______j ,.R *-,ZINC, TOTAL SAMPLE 1 2_) 0304(AS ZN) MEASUREMENT (26) 0.053 (19) 0 240 GR01092 1 0 0 ;-'.PERMIT-

.-, -' -': -.EFFL.UENT GROSS VALUE OEE._ -:- LBS.DY '. .MG/L --WEEKLY.

GRAB-3VALUE~OXIDANTS.

TOTAL SAMPLE 126)RESIDUAL MEASUREMENT (26) (19) 50034044 1 0 0 *PERI , 05 .' .........

EFFLUENT GROSS VALUE ~JEU8AK2

~ Z~LBS/DY r-. -MGAL-~ EKY "RB__.____._._._

________._--_

-,.AI:Y..AX'.

'.,,--- .-.FLOW, IN CONDUIT OR SAMPLE 31)5THRU TREATMENT PLANT MEASUREMENT 241 32.71 (03) -- 0 1N50050 1 0 0 -P"E;: " " RBP T "'2--"EFFLUENT GROSS VALUE M-REOUlR&4NTc D:lYi'- _GD .'.o-",-

"'-___-____"

-:_-_ ....CHLORINE.

TOTAL SAMPLE 2)01RESIDUAL MEASUREMENT 0.(26) 017 040 (19) 0 240 GRsoCoro -:_ r- .:.n.rt ..trZ +, .- -..-+" ' ..-.....

.. .. --.... +--* --50060 1 00 -'. M M~-.-* --, -:"' .... .+ = = LBS/DY .'+ -.3. " *"" .........

',-'.:: MG/L ""~' -E KL ' R BEFFLUENT GROSS VALUE REQU .M.IRE= I j/. ;T.-". " ______ 30'DA""AVG

-" .;'A- :MA""::;_

_'_ '--HYDRAZINE SAMPLEMEASUREMENT (26) (19) Soo81313 1 0 0 ? ti 7.~j-+/-2 , ~~ 01 Dl______________

____-DILTAX M/LY-WHEN'1 GA*EFFLUENT GROSS VALUE -.EO-fl E~z M-t -AP e-t~ OSH~GN 'e"GA*z'-

NAMf~fL Icauny der penaty of law that ths dacument and aff attach*Mnt were prepared under mPICPLmunEOFFICEtR TEtLhEet im rdhei:awt.

n oitr. a ~FE IPHONE DATEproperly gather arnd evalute the kw inalaw suntmea&

-ae fn y kqwry d the persan -t petn 1 4830Bradley J. Adams woManage the esyeM. at thre person adirety raponsie for gafthe~g the fnonatlon.

the 81PR5 j08 09 16Plant Manager aware era ther are signiicant Penaltie tot sUlm"dur talse mfonnrto.

mecldie the poas~ibey of EXECUTIVE OFFICER OR ARUEEAYA MNH ArireRýý and inrrisionment tat knowing vioLaton.

AUHRIE AGENT__ COD_ 'jNUMMEYERMNTH DACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)Per Special Condition 4C.. tihe maximumn allowable blOwdown temperature calculation results are provided on the attachment SEE ATTACH4ED EPA Form 3320-1 (Rev 3/99) SO PAGE I OF I NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winlield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER002 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

NO DISCHARGE E ...4MONITORING PERIODYEAR I MONTH DAY EI AR MONTH DAYFrom:1 0 1 a 1 0 1 8 1 0 1 1 ITo:! 0 1 8 1 0 1 8 1 3 I 1I i I I I I !I I I I i I iNOTE: Read instructions tbefore COMDletin his formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLERN OF TY'PEP M AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISPH SAPL (12)PH ~~~MEASUREMENT

-- -(200400 1 0 0 ~ -'K*PRMr~r 777 SEE ~ -'9. .EFFLUENT GROSS VALUE R' OUIR--'.'E X --' U ,._ , MIN ... .._. __ ._ SU ...-.- ... _.-SOUDS. TOTAL SAMPLE 2_)SUSPENDED MEASUREMENT (2 (19)00530 301 0v 0 ..5.1 .GSAE"!00530~~ 17 -E M-it'~~ . __ LBS/DY M 'G 150- .-;E .RUFEME.T;F.L--U_-"E.G_

,. .VALUE. G.. -:L .MA- L. -. , ERMIT..-""

CHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT

26) (19)01032 1 0 0 ýEM T~~,.-01 J-- "0.2 --..L.SDY .... .-.. .-MG/L...,

.l -',EFFLUENT GROSS VALUE _.!MW0A6AEW f ".. + B ., -. 30DAYAVG-

" M.DGACHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (26) (19)01034 1 0 0 vr-. -+ _ --. ---EFFLUENT GROSS VALUE REIR--Q' E T , .' .. " BS/DY ",T "--".. MG/ .*; ,".Y. ' :-GRAB'-.

COPPER. TOTAL SAMPLE(AS CU) MEASUREMENT

2. 19)01042 1 0 0 ~ iPERM:V T MG DALY ý B/IEFFLUENT GROSS VALUE ..-Y -7.f--:.-+.

.0D5( ..0 .. -,

IRON, TOTAL SAMPLE 26)(AS FE) MEASUREMENT (19)01045 1 0 0 I ,i. .... -.. -t-~ ~LBS/DY -MG--/1DJ

'(¶10 *' ALEFFLUENT GROSS VALUE !'REQ " E -. .r.,A ".,., -"__t_ + -., :., +:.__.__

,_..- .LEAD, TOTAL SAMPLE(AS PB) MEASUREMENT 19)01051 1 0 0. ..: ....... ....+ ....... .... "--'.. .... .'. ,---:.' UD U Y.-? .-.J:0 mEFFLUENT GROSS VALUE E '.UIREMEN1._____

BY .MAX .....G... ' .... GASUPRNCIPAL EXECUTIVE OFFICR diecon or .supenisin i a wit a system desined to assu p TELEPHONE DATEProl~e~fgathrand vafttheinfrmatio~nsubitte.

Basedan my axpify of heperson 81 z6-7Bradley J. Adams who ImnaSP 10e system. or vtose persons directly respomiubl for gafrerig the imomation.

the I1 406-3 700inomtonsubmitte is. to the best of my Moieg and baels, true, accurate and complete i am SIGNATURE OF PRINCIPLE Plant MWanagger I ware #W 0-eare s~uknt Pamnaft ffsubm" flsbeinform-atmion.

rmxkxl te PSyof EXECUTlIVE OFFICER OR AREA NUME 09A MO1HDArtPDORine and Imp ent for k-,-S viNlations.

AUTHORIZED AGENT NUMB YEAR MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. No Turbine building wastewatar was discharged to the Stormwater Runoff Basin during the month.2. This discharge point was not used this month.A Form 3320-1 (Rev 3/99) SD PAGE 1 OF2mwv NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMITTEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWanenvifle, 0 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBER002 0DISCHARGE NUMBERI o MONITORING PERIOD II YEAR I MONTH ,DAY I YEAR I MONTH DAYFrom: 018101810 I I 1 I To:l 0 1 8 1 0 1 3 I -, I1MAJOR(SUBR 01)F- FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

NO DISCHARGE r ...I I I I I I II J I I I I mNOTE: Read instructions before completi this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY PARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISNICIKEL, TOTAL SAMPLE (2_) 19)(AS NI) MEASUREMENT (26)01067 1 0 0 %.E R A T., i ... :.... , , ..." -" .., " O " ,..-: --LB S.D Y .: .--M G / L O M LY" -G-AMEFFLUENT GROSS VALUE R E*40!DAY-AVG L _ _ZINC. TOTAL SAMPLE 26) 19)(AS ZN) MEASUREMENT (2_)_(19) 01092100

". -LBSDY.."......0

-MG/L -DAL'YRABEFFLUENT GROSS VALUE -4EIE..-R.E-

.T " ______._Y

__A___,.

.'...- 7-SAMPLE____

OIL AND GREASE MEASUREMENT (26) (19) 50003582 10 0 7-47ýlý __21_ -TWICM ~ GAEFFLUENT GROSS VALUE M. OIREbIENT

-.L,. -DY __.. .,0AV, ., -G-..FLOW. IN CONDUIT OR SAMPLE __:_THRU TREATMENT PLANT MEASUREMENT (03) -5o050060 1 0 0 1'7PERMIT,;-;;:Q

-BEPRT- ".EP.T MGD _- -"' 24..........--

T- TOTALIZ.!

EFFLUENT GROSS VALUE ROUREN.,

QDYVG'-DAILYWMAX,-'

____M:..=G-"

40DSAMPLEMEASUREMENT SAMPLEMEASUREMENT

__________

__-____.___-.___

_

___...:__....____._.___..__..

...-SAMPLEMEASUREMENT,

__ _ _ _ __ _ _ _ P5 U R E T --.-- ? -, .-:- ..+ ..-... :-__ --: ..

....-,.rEAsREMET TELEPHONE DATEPFUNCIPAL EXECUIVlE OFIFCIER

&ecion or 3qvW in accowar" vrite a sytr desiged to ass"r that 41a1~ personnel property gather and waOute thaIno onnw su itted Based on my ai wy of the person or person 815 406-3700 08 09 16Bradley J. Adams Io manage the system, or tho p0ensOr dftcy -sp-ine for gasthang the e 8 MOF406-370 ifotniation submtted is, to the best di my wInoge anti befiel, true. accurate, and complete.

I amn SIGNATU PRINCIPLE Plant Manager aware there are snlicant penaitie for sulnstg falseo -ettomon.

mauDa the posstY of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYIWE) on PARan Fine ard utrsiobntt fo nowing via. AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 August 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)08/02/0808/09/0808/16/0808/23/0808/30/0812012012012012088.889.387.491.690.0Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of August 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byrýshWhyrndhk 1crk\Month~yDMR~auiachO I \AugO8 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 August 2008COMMENTS:

I. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.k:byr ch\byrondb\cI.crk\Month~yDMR~attachO I \AugO8 EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

(Minutes)

U- U-2 U-l -"-08/01/08 60 62 08/08/08 51 51_08/02/08 60 60 08/09/08 51 5108/03/08 53 52 08/10/08 50 5008/04/08 60 6008/05/08 60 6008/06/08 50 5008/07/08 50 50HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 08/05/08Time: 10:21Analyzed by: M.H.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26c 0.240.220.200.180.160.140.120.100.080.060.040.020.00"____-- --------... 1.. __ { .r .__________ ___ *~-~ iz255075Minutes100125SS 9EXELONBYRON STATIONPermit IL0049313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes) 08/11/08 52 5008/12/08 52 5408/13/08 50 5108/14/08 50 5I08/15/08 43 4508/16/08 45 4408/17/08 34 45HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 08/ 11/08Time: 10:32Analyzed by: J.E.D.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26l 0.240.220.200.180.160.140.120.100.080.060.040.02.O0.00-Il i II " 3 I _ _-..........

I..... I i J [ f ____V ' I E i ! 4 1j ~ ~ ~ ~ -- TyV7TZh T771~--~~ ---f1T 1 _ _ LW 1 -741 1 1-iI j .II ) ! If I ---i, ' ---.0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

_U- I U__08118/08 45 4508/19/08 45 4508/20/08 45 4508/21/08 45 4508/22/08 45 4508/23/08 48 4608/24/08 46 46HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 08/20/08Time: 09:15Analyzed by: G. P.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.E0l.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00025 50 75 100 125 150Minutes1750

\EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-208/25/08 45 4508/26/08 46 4508/27/08 40 4008/28/08 40 4008/29/08 40 4008/30/08 40 4308/31/08 40 40HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 08/25/08Time: 10:00Analyzed by: D. B.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.E0.C.0 .50 ...., 1 1*1 1 1 1 1 1.0 .4 8 1 1 1 1 1 .. ...0.460.44 ,--0.42 ---+-- -.0.400.38 -.. .-. ..0.36 ... ..... .. ... ..0.34 --. .. .......0.32 ... ...-- ----0.30 ... .... .0.28 0 ---..+/-0.26-. .. .._ I0.24. .....0.22 ..... .0.20 ......0.180.16. .. ... .0.14 -.. ... .0.12. ......0.10 ... ._. ..0.08 ---------- ----------. .0.04 .. ..0 .0 2 -,, , .. .!.,. .0.00. i. .. .i..0255075100MInutes125150175200 Exelkn.Exelon Generation Company.

LLC www.exeloncorp.coni NucleaTByron Station4450 North German Church RoadByron, IL 61010-9794 October 17, 2008LTR: BYRON 2008- 0107File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #19Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number1L0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units 1 and 2. This report covers the period September 1, 2008 throughSeptember 30, 2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradle J. AdamsPlant ManagerByron Nuclear Generating StationBJA/ZC/sdk Attachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (WMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron,IL 81010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCROS01MAJOR(SUBR 01)F- FINALOEMINERALIZER REGENERATE (00tA)EFFLUENT...NO DISCHARGE I .. -MONITORING PERIOD IYEAR MONTH I DAY YEAD MONml DAYFrom:l 0 I 8 I 0 I9 1 0 Io:f 1 0 a 1 0 1 9 1 3 1I0 1.....I II I I I I l INOTE: Read istctions before comlebn this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY PARAMETER OF TPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOUIS. TOTAL SAMPLE 26) 0.7 0.7 19) 0 285 ECSUSPENDED MEASUREMENT 00530 1 00 0M....C"--'

.....Ot.,EEFFLUENT GROSS VALUE REQLBREMEI-

-MAG-,..CHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT 01032 1 0 0

-u- .. -'-BS/'Y

-.-M..o. -" yA-LY -EFFLUENT GROSS VALUE REQU1REMENT

-31,- -yA VKGR'.. 30" AVG.Y--..

CHROMVIUM, TOTAL SAMPLE 26) 19) 500(AS CR) MEASUREMENT (2_)_---_-_(19)_5_0 01034 1 0 0 4F.BIT LBSIDY -- /hEFFLUENT GROSS VALUE n.RE.;i+'E.

N.'LS -Q'.',-"

.G".AI- BCOPPER. TOTAL SAMPLE (26) 19) S00(AS CU) MEASUREMENT

___(2____--____)___

01042 1 0 0 -EG W..... -.* -.- .....-EFFLUENT GROSS VALUE ,- ...:;,, .-... .. LBS/DY ... .- .A .,-W M -;:': DA+. Y , -.......AIRON, TOTAL SAMPLE 26) (19) 50(AS FE) MEASUREMENT..,,

-01 4 1 0T :.. ". .-. -. LBS/DY .G-.; ..,. .. V '-. M /-./ AILY GRAEFFLUENT GROSS VALUE JLY-RUEW

_-____.:

.t. -, ,A -,LEAD, TOTAL SAMPLE 1 26) 19) 500(AS PB) MEASUREMENT 01051 1 0 0 *..E': dI -. , ". ..DY'" '--' " .,'.0M4""I.-

" ..'D A.EFFLUENT GROSS VALUE RE--.qM+-T

,.,. -.- .._ _. 1W._.....

NICKEL, TOTAL SAMPLE(AS NI) MEASUREMENT 0106 1 .0 0 L-.S/DY -_..MG/L......_..

1., "EFFLUENT GROSS VALUE ; .4.._'..

, LBS/DY -" 304-AYAV.G-DALY.MAX

--

I cery under pwmlly of lw UmI foctdepr ann all anlachlmes were preparecl under "y 0 TELEPHONE

/d ,q&ATEPRINCIPAL EXEGUnVE OFFICER d or supenmon in accodafnce wih a sytemn desigse to asw. tgo quafled pesorurwr pmopeit gather and situme. Baaed oi ry o the person or persons d406-37811 40 -0717Bradley J. Adams whomanage the system. o mose persons diredly respomsbe for gaumeit me eWtonm.ub

, 8 08 10 17rmonnabon submitted is. to he best of my knwleaud and beed, tre., accurMe, anrd conpilte.

I a SIGNATURE OF PRINCIPLE Plant Manager awaretem are siWucam penalties fo stlsurnglfatese Wrnfanon.

m1c01M the posstft of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYCm PRIM and uislonsen!

for l vlato. AUTHORIZED AGENT CODE NUMBER YEAR MONTDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all altachments hee)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed 22 of30 days during tis month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1OF2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE M3ONrTORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. L.LCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBERI MONITORING PERIOD II YEAR I MONTH I DAY I I YEAR I MONTH DAY IOCR0501MAJOR(SUOR 01)F -FINALDMINERALIZER REGENERATE (001A)EFFLUENT...NODISCHARGE E--Z ...I I l ll" I ; I .lFrom:! 0 I 8 I 0 I 9 I 0= iI 11To:l 0 1 8 1 0 1 9 1 3 1 0 1I I I i IO mByron, IL 61010Byron,__

__L__ 61010NOTE:

Read instbructions fore completing thi formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREUENCY SAMPLEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISZINC, TOTAL SAMPLE 12-) (19) 50(AS ZN) MEASUREMENT 01092 1 0 0 W-I'" T .. DY ,- Y.0- ,GAB.EFFLUENT GROSS VALUE *RE-UIREMENT

--. .-: .-_____, LDY ":' 30 DAY AVQ:.. , MGCI_ ". .FLOW, IN CONDUIT OR SAMPLE (THRU TREATMENT PLANT MEASUREMENT 0.007 0068 (03) 0 135 CN50050-1.0,0

--. -."REPORT

.E..-OR -F13 ,EFFLUENT GROSS VALUE* .." -.., -. DA-L :... ,.SAMPLEMEASUREMENT

.. ....... ....... ..-.*: ::'-".::':

--' :-, , ""____ "- *, °" "'". " " __,___" _"',, _ -'I-. : ....' .-,- -SAMPLEMEASUREMENT

________

BOIaET--..

" -.-,, .. ..,. ........SAMPLEMEASUREMENT

__'_"" ,-. -' ""._" '_"" "-PERMIlT~

-SAMPLEMEASUREMENT

,, M W- -.:".----..

.' " -"6SAMPLEMEASUREMENT, SAMPLENAMAE1TiTLE Icosmufy wler peia"Z al law 1131 VMSa doewuwa arid ail auivnerimra weepeae under my TELEPHONE 1A1 ?..&IODATE PRINCPAL EXECUTIVE O *aICER to suprvs in acorsance wfh a symsin to Ea peud Pess-nrel

__p W J RCE y Bo 815 406-3700Bradley J. Adams who manag the sytem or ftmz penmn arecdy sponstt fora gahwft the vd W fte 8101nmb suaim, s. to th beg at my o mf m adp ant beli. true. aim= ca nme .a c In SIGNATURE OF PRINCIPLE Plant Manager aware dat there am sqiWcan p Ipfr bas" tabs WOMUSlM boddk=m g tMe POSWbly d EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTwYE on PMITNI fin and fnpi W nowing AUTHORIZED AGENT CODE_COMMENT AND EXPLANATO OF ANY VIOLATIONS (Referemn all atacawtsa herEPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2SS9 NATIONAL POLLUT1*SCHARGE ELIMINATION SYSTEM (NPDES)DISCH MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60655FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, UL 61010IL0049313 PERMIT NUMBERB01 0DISCHARGE NUMBEROCR0501MAJOR(SUER 01)F -FINALSTP EFFLUENT (FORMER 0018)EFFLUENT.. NO DISCHARGE MONITORING PERIODYEAR IMON" DAY YEAR I MONTl DAYFrom:1 0 I 8 I 0 I9 1 0 I i I To:[ I 0 I 0 I 9 1 3 1 0 1...... !I s a I I I !NOTE: Read instructions before completing this formQUANTRY OR LOADING QUANTITY OR CONCENTRATION NO.FREQUENCY SAMPLEPARAMETER N. OF TYPEP M AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS Ex ANALYSISBOD, 5-DAY SAMPLE <0.17 <027 26) <2.0 2.0 19) 0 290 DC(20 DEG. C) MEASUREMENT 00310 1 00 30PE.-7T,."

Y3 -- MG/L -. -" WCE..0 4:.

-300 L,,8&&DY

'., "...* ... .:"" " M EFFLUENT GROSS VALUE AY.AVG AVGPH SAMPLE- 7.30 7.33 (12) 0 290 GRMEASUREMENT 00400 100 0. -P- WEFFLUENT GROSS VALUE R"QU:IR-':

"- D. -2 " -9 .SUSOUDS, TOTAL SAMPLE 0.12 0.21 26) 1. 1.6 19) 0 290 DCSUSPENDED MEASUREMENT 00830 1 0 07 f LD'- -. --90.0.,' .EFFLUENT GROSS VALUE ..REQUIREMENT

w. G DY .DAA.FLOW. IN CONDUIT OR SAMPLE 0.008 0.017 03) 0 135 CNTHRU TREATMENT PLANT MEASUREMENT 500 .0 1 0 0 .-D ---DAI-.L-Y-_

-..' --" .N""EFFLUENT GROSS VALUE .'--. -MGD " """ -- 2"-D "__.__ _._ _.. .._ _.-EQ U E A21 11. ._.. ._. ._," .._.. -..SAMPLEMEASUREMENT

____i__'__"____-____-__

_"_:-r ----SAMPLEMEASUREMENT

__________

____ ___-...... ....: : ; .: ;-: + ...- .: , , .: ._ o , , .+ ...+ , -: .: ._ ., , + .....: ....., .-. .- ...: -SAMPLEMEASUREMENT S-t" ' " + " " + ... .. +- r" ' + .y ..." " 1 -.." ' ' " " c -+-. --*.- ..' -' " + " .".- l .' : " -' f "MEASUREMENT

___NADWEIT1E I ceitl undler penially oflaIw 'ha Ont docmlnartar ad a aanadowon~

were prepaM redds; enq '/ L / TELEPHONE DAi~. A TIppganradeaath armlmRnd a i x~ ff esno esn 1 406-3700 Q(I1DTBrdly .edms wh lw athe andM o evitse phersn kitmal

repos fo gatf MeZ uIr in 1 17IS ioramaaWi.tftbst dn aepndbia tu.m s.aocveIar SIGNATURE OF PRINCIPLE

_____ ____Plant Manager aware thal Core are sgntisM penalies for subammg Iases Irormm=%~

uckm& the possbWl d EXECU'rIVE OFFICER OR JAREAJ NUMBER YEAR MO0NTH DAYTWEVRO I~ finIO e and hullptawww t or WwAV v"ios AUTHORIZED AGENT CODE___ ____ ___COMMENTS AND EXPLANATION OF ANY VIOLATIONS (R~efemnce all attachments hers)1. Flow existed through this ou. all 29 of 30 days during the month.EPA Form 332D-1 (Rev 3M9) SD PAGE I OF 1I NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES]DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEIADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenvilWe, IL 6055FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010!L0048313 PERMIT NUMBERco o0DISCHARGE NUMBEROCRO501MAJOR(SUIR 01)F -FINALWWTP (FORMER ODIC)EFFLUENT... NO DISCHARGE MONITORING PERIODYEAR I MONTHI DAY YI YEAR1MONTHI DAY...... I2-- .; .7. .;,From:I 0 I 8 i 0 I 9 I 0 I 1I To:l 0 1 6 1 0 1 9 1 3 1 0 1NOTE: Readinstructions feore comoleting tis formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FFIEOUENCY SPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (26) -1.7 3.4 (19) 0 240 DC00530 1 0 0 -0.EFFLUENT GROSS VALUE ______-_

v L00MYCHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19) 50001032 1 0 0 -'-L-EFFLUENT GROSS VALUE TRE.N -.. -..S.Y .- 0.f'--" " '." .;"' "", " 3 0AYA.. , ",AILY',.'MG..'-,-

' A:. "G * --1.-..CHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT 1 26) -- (19)_5001034 1 0 0 --. .. -, -.: .-,-E F F L U E N T G R O S S V A L U E R I D J I ....- _ _ _-_.. ...- ." ......." , "- : D,. .M G I L *. D A I L Y .R A .COPPER, TOTAL SAMPLE -( 500(AS CU) MEASUREMENT (2) -(19) 50001042 1 0 0 7" -- ..." -EFFLUENT GROSS VALUE ' UIR K :N. "-- "='- " ---'GQYA...

..__EFFUEN G MGDI DAILY .'GRA13--'I ROSS VALUE ... ..........

.' YMAX --- ..IRON. TOTAL SAMPLE(AS FE) MEASUREMENT (26) -- (19) 50001045 1 0 0 -. ....-- _ .: , -._-'- L DY"--- .: .-.Q : .O "'- .""" >--"IBS/DY 4 3 1

.'"MG/I.

MAL iWEFFLUENT GROSS VALUE 7i" *"' ." ": ."- -30DA.....

DAILY MAX M/ i .........

LEAD. TOTAL SAMPLE(AS PB) MEASUREMENT (26) -- (19) 50001051 1 00 7-7 ppRvrW ý :,L;`2 --L.BiDY -"I .' MG/L MDALYMw.'

EFFLUENT GROSS VALUE -REQUIREO IENT " -*.. , ;'j-A," -DAILY-MAX..

-- --(AS NI) MEASUREMENT

26) (19) 50001067 1 0 0 74P-.M -:-

" LBS/DY -:Z=. .-.-. .-.- ,- .: , --2-0EFFLWENT GROSS VALUE EOJRMI ..*.*- 0DYAG -DIYMX M/. -DAILY' GANAMEMITLE cnIy car* stle penalty d law toa buts docwriuiz and 1afl acnauwft wens preparad w~ars mny TLPOEPRINCIPAL EXECUTIVE OFFICER drecizon 5uwisio4ne kt aaccordanwe oti a to assuTe that quaqed pesonnelp0ey)gaterand evabie the Inlonmabon sutb tad. 6aon my nr ydthe peon peions 815 406-3700Bradley J. Adams who manae the sYstem Or rme perosso dkecly responsible ir gathering the Irnawmo.

he .08 10 17inimtnaton wmined is. to the best my owtege and babel. tu, accnue and comlete, i am SIGNATURE OF PRINCIPLE Plant Manager aware thdt SUem are swllrdllat penalties for sutft faise iot. ft possily o0 EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYEDORE fine aon for knowing vioatons.

AUTHORIZED AGENT CODECOMMENT AND EXPLANATION OF ANY VIOLATIONS

( ,feimat' all alachmetta hem)1. There was no dscag ot processed steam generator chemical cleanring waste water during this month.2. Flow existed through this outfall 19 of 30 days during the month.Form 3320-1 (Rev 3/99) SD PAGE I OF2a0v NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrewville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010ILOOM13PERMIT NUMBERvol 0DISCHARGE NUMBERMAJOR(SUOR 01)F- FINALWWrP (FORMER 001C)S EFFLUENTIMONITORING PERIODI YEAR I MONTH IDAY II YWAR I MONTH IDAY ItI : -. " -'."I IIFrom:l 0 I 8'1 0 19 1 0I 1 I TO:1 I 6 I 0 I 9 I3101* * *NO DISCuHARGE El ..NOTE: Readinst ctons before comoleti thisformQUANTITY OR LOADING QUANTITY OR CONCENTRATION EQUENCY SAMPLEPARAMETER NO OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT 010 92 1 0 0 .. c ... , -" ..0 2ff-EFFLUENT GROSS VALUE -:"- , -.OIL AND GREASE SAMPLE -- (26) --1.6 1.9 (19) 0 240 GRMEASUREMENT 03582 1 0 0 .G/ ,E[Z- WEECY~ GE-____ ~~~-~- ~ LBS/DY --*1Q/L0.EFFLUENT GROSS VALUE , "W R-""' ."-' ----- .-' " , ..FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.026 0.066 (03) -135 TM50050 1 0 0 pRT -.P--. M-WATEFFLUENT GROSS VALUE ."REOdAW 40D' L ---"-. 36 -SAMPLEMEASUREMENT

.M--_-_...REASU:REMAENT

.-- .-. -, .SAMPLEMEASUREMENT

... ... -..a,: : ...SAMPLEMEASUREMENT RAEOLMR-EA

_ _PFUNCIPAL EXC EOFIFICER Weoo orEPON /*Mh a% acw-"w Sa.dwdt susolWf"pso Bradley J. Adams who imnge doe swsam. or xee persorts

MCI r mspowr for eMmNg "h w~mmim the Ji a-o,W.in Ubmitied s, to the beet ot .y Io an d. bu.lel,.

Kiu- ..curate.

and complete.

I am SIGNATURE OF PRI NCIPLPlant Manager evawa1tre tftme a somignlm periollift IC' um ftalse bomatWt.kx Wckj~gft postft of EXECUTIVE OFFICER OR AREA DAY _ __ 1OR P'PME kq~sorum to WW& Wv AUTHORIZED AGEN NUMBER YEAR MODTYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachmentst heme)EPA Form 3320-1 (Rev "gu) -SO PAGE2 OýF2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERDol 0FDISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 001 D)EFFLUENT... NO DISCHARGE E-"I MONITORING PERIOD° MONTH DAY I YEAR ONTH DAYFrom:l 0 I 8 I 0 I 9 I 0II I To:l 0 1 a 1 0 1 9 1 3 1 0 1....i I lNOTE: Read instructions before cor.eti this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREUENCY SAMPLEpARAMETER

..OF AMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX AALYSISSOUDS. TOTAL SAMPLESUSPENDED MEASUREMENT (26) -< 02 < 0.5 (19) 0 240 CP00300 ~ PRM~ '--.- LBSIDY -~ ~ -15.0.:~n WEEKLY CtPSEFFLUENT GROSS VALUE .-EUIRF ENT -_;__""" ." .- ' ... *- _ _....:- ";- .'., .-':." ..30-4 Y_Y:VGý..:

.",DA OIL AND GREASE SAMPLEMEASUREMENT

-(26) < 1.4 < 1.4 (19) 0 240 GR03582°1 0.0 7 PERT.. .... .. .....EFFLUENT GROSS VALUE -.RQUIREMENT 7-.... L Y. -L-'5y. -.0 --.- "FLOW, IN CONDUIT OR SAMPLETHRU TREAT1MENT PLANT MEASUREMENT 0.023 0.023 (03) -0 135 CN50050 100"--" --0 0 -:. -.R..MD A .... , .. -..-.DILY-_.

C.N-INEFFLUENT GROSS VALUE '-.REWJgSPEkr

.30..YV,-

_-D;LY .AX .. -';"-" _ _ " '" " -"SAMPLEMEASUREMENT.:. ....., ; -..... .-..- ... .: .. .* -... ,SAMPLEMEASUREMENT

ER T ..: ... ..r. '..:.,.,

-...,..z,

'..... ,,_ .-"SAMPLEMEASUREMENT SAMPLEMEASUREMENT

.. ..*. .., _ ., , .. ....,.. ......O .; .' ..-,77..........

...NAM~n~IUE I certif wider penall dt law dht iaM doc.marad and aD aliatwanee were prepared wider my i-/.PRINCIPAL EXECUTIVE OFRCER *io am-- sweo in accwdance wdh a systUu desgned to a m1.4idI TELEPHONE

-/9 qedOnATEprpery pa#W arid vaOuIBte mffionni aubmitted.

Based anmy of the per e,, v85Bradley J. Adams who manage me sysltm or hose pemso drectly fo gaheMg the ifnnfwia ithe 815 40F-3700 08 10 17idomnatbonsutl d is, to the best at myn taw ie arid beelie, Mi ancunae.

and cuwrm , tam SIGNA RE OF PRINCIPLE Plant Manager aware al the#e are sdican perealies for lase votd5 -0 Vc the pasOW ot EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYaOR .T fin and upgirs er for timVg viwawiwe.

AUTHORIZED AGENT ECOMMIENTIS AND EXPLANATION OF ANY VIOLATIONS (Refeence anl anachmtenft.

e1. Row existed through this outfall 9 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 14wIVL SNATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMIrFEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWaremnville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 610101L0048313 PERMIT NUMBERE01 0DISCHARGE NUMBEROCR0I01MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001 E)STORMWATER

- - NODISCHARGE I MONFTORING PERIOD I1YEAR I MONTH I DAY I I YEAR MONTH DAY 1From:1 0 I 8 I 0 I9 1 0 11 1To:l 0 1 8 1 0 1 9 1 3 1 0 1n.j S .nugu *a .0PARAMETER QUANTITY OR LOADING QUANTITY OR CONCENTRATION AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITSSAMPLE2)PH ~~~MEASUREMENT (1200400 1 0 0 ".-ý' /E.RMIT "7.7 " ; ' °: , ." -" --.]i:.. eo EFFLUENT GROSS VALUE 7 M-SOLIDS. TOTAL SAMPLESUSPENDED MEASUREMENT (2_)_1_)00530 1 0 0 , M. ' --- .-BD -1.O 30.0EFFLUENT GROSS VALUE --"-.SY "- ".-0 LOWIY :.DM.'MAX.

MG/LCHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19)01032 1 0 0 ' P.RMI" -- LBS.DY 02EFFLUENT GROSS VALUE I-RUIRE ; -"- -3.CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (2_)_19_01034 1 0 0 .. -I n .. -RO-S- VALUE ... LBS/DY ..-1 1......EFFLUENT GROSS VALUE 30,___ ._ _ PAW-' .-_ ._ _.__ -. MG/LCOPPER. TOTAL SAMPLE(AS CU) MEASUREMENT (25) 19_01042 1 00 0-" --.' -."- -- .,' " " LBS/DY J"1 MG-LEFFLUENT GROSS VALUE F _0 AUIIIRON, TOTAL(AS FE)01045 1 0 0::F'FLI I 11NT VAI IJFSAMPLEMEASUREMENT (26)LBSIDY( 19)MOIL5W.jA V~ 1DIYAEFLUN GROSS~ VALUEI I ~ -.......t ILEAD, TOTAL(AS PB)01051 1 0 0C1M I ICKM %JAI I ICSAMPLEMEASUREMENT IS26)LBSIDY__ __ ,_ __ _* .,- ..---- ,--. ...I 9s)MG/LAcvlr'04~DAILY

AB --',- *'--.- ..--- --= ___________

=.= -.i. // /1/ a

.......NAMEA1TTE Iceney ur~er polfan ol law Mal Ous doomieMs and an Watmefila were prevare undr my TLEPHONE lv,19.06)ATE PRlINCIPAL EXEcuTIvE OFFICER cireafon or superwism m a0ccodance with a systm designe to asure *0a qum~ed puoe"ef~pty gaawe and evalute the mfonnatam sunmitta Sean at y inqur of the peiscn ors OZre815 406-3700omadonnaa Ru~nkW Is. to toe best of ay Maoledip and beefi. Mue, acurate, and conp=e. I amn (OF PRINCIPLE Plant Manager dley the.a m swcard p Io suAd=vam falseaoim

% mainge the posss. e op EXECUTIVE OFFICER OR AREA NUMBER YEAR t0NTH DAYTP O n e and for knwwbg vialatiw AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Refefenee all atlashmeont here)1. No Turbine bilding wastewater was discharged to the Stormwater Runoff Basin during the month.2. There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through Oth outfall 6 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 21 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., ILCADDRESS 4300 Winfield RoadWarrenviiie, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 610101L0048313 PERMIT NUMBERE01 0DISCHARGE NUMBEROCRO501MAJOR(SUAR 01)F -FINALSTORMWATER (FORMER 001E)STORMWATER

NO DISCHARGE MONITORING PERIODYEAR MONTH DAY I EAR MONTH DAYFrom: 0 1 8 0 1 9 0 I 1 1To:I 0I 81 0 1 9 3 1 0NOTE: Read instructions fore completing this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY

-PARAMETER OF SAMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS Ex ANALYSIS TYPENICKEL, TOTAL SAMPLE (26) (19) 500(AS NI) MEASUREMENT 19_EFFLUENT GROSS VALUE -REQUIFIRMENI.

-"." "DY 30D-AY"-1.0

, 2.0 -,. .ZINC. TOTAL SAMPLE -(25) '19' 500(AS ZN) MEASUREMENT (2,)___(19)_5__

01092 1 0 0 zE]IT :" : -MG/I .DAILY---'

GRA8"'..' LBS Y .- , 10' DAIL --2'.0EFFLUENT GROSS VALUE > --- .3AYAG- AIYMAX-OIL AND GREASE SAMPLE (26) -ZO Z5 19) 0 29 GR03582 1 0 0L26D -<-0 --(0 0 2EFFLUENT GROSS VALUE R

.' "- .30-DAY A-Q -"OAY , AX MG/ --." "- .FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.396 0.948 (03) --*-- 0 290 TM50050 1 a 0 P Ir-IRT. --R .-.-:- ." .-1NICE .-.EFFLUENT GROSS VALUE 'aP, .a. DAYVG --:IY f-o MGD -- -. -, "-" ." """ NTH- TOTAIA.-.. ..... ..-..,_ _.. _-.,SAMPLEMEASUREMENT

___________

-REQuIREMEKLr-L-- -.~.SAMPLEMEASUREMENT SAMPLEMEASUREMENT

-- ,.qM I- -" , , -. ...-" -." :ILI ....... -....... ' ":.-,. ;- , '. ", ..-0'; :-. :. '. ý.,.-, ..: .- .KA EIITE M W " wftd mw#% ot zrnnt"dal al wheM irem peeated undler m i TELEPHONE PRINCIPAL.

EXECUTVE O detn or supeasism in calcance wdh a system desined to assLue Ua qualW pei-minne

,{wpropeny gadvar and wf the Inbrmom~n abtrnfteM Based on my kquiry or ft person or pemons 854630Bradley J. Adams who manage te system, or those persons drectly responsbe for gashering th _rdom__n,-

815 406-3700 co 10 17aohmatn I, to the bet of my knledge and bee, tR.m. accurete and canpielte, I an SIGNATURE OF PRINCIPLE j MPlant Manager eawas no the amresoaffint pe foiestot subiang alseomai.

ir" the posabify of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYrw cPEO --Rfnn ne n" im -dkr~ene ftwW -kn mng ow -tor AUTHORIZEED AGENT C DCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachiments here)EPA Form 332D-1 (Rev 3/99) SD AwPAGE 2 OF 2aW 0NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCR0501PERMITrEE NAME/ADDRESS NAME Exalon Generation Co., LLCADDRESS 4300 Winfeld RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 610101 11.901081 I I=001 0DISCHARGE NUMBERI PERMIT NUI , MONITORING PERIODIFm YEAR MONTHI DAY I I YEAR M4ONTHT DAYFrom: 0 1 8 0 1 9 1 0 1 1 I To:I 0 1 8 0 1 9 1 3 1 0MAJOR] (SUBR 01)F -FINALCOOLING SYSTEM BLOWDOWN" EFFLUENT~NO DISCHArGECm t I I I I .*NOTE: Read instructions fore comptefin mis frnmQUANTITY OR LOADING QUANTITY OR CONCENTRATION No. FREQUENCY SAMPLEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH SAMPLE 8 ,ME ASUREMENT

-- 6 G00400 1 0 0 -.....--. .9 .0 ......EFFLUENT GROSS VALUE --U, EUT :- ". -- M " "AXIM"M -;'"_____

-COPPER, TOTAL SAMPLE(AS CU) MEASUREMENT 2() 0.012 (19) 0 24 GR01042 10 0 -'-:00W.07 MG1 -EFFLUENT GROSS VALUE r-REW _ _ _ _ _ z _ -ZINC. TOTAL SAMPLE (26) 0.038 19) 0 240 GR(AS ZN) MEASUREMENT

__.__) 0__01092 1 0 0 .' -*A-- ..2 1.0"EFFLUENT GROSS VALUE -EQUIRIE-Y :. "UL Y,18 " ". .' DAILY _ "AX_' I/ -.w W Y .. :BOXIDANTS, TOTAL SAMPLERESIDUAL MEASUREMENT 2_) 5_34044 10 -0 0" ."1"'""EFFLUENT GROSS VALUE ",_:_"-_-"

-'" ...- " " -.M-0 .Q-A E Y W,.... ..ME T -~ -.__ _ _ _ .__ ...-.. ...... .. .. ..... ., A -LY .M ,, --_ ...W _.. __ --FLOW, IN CONDUIT OR SAMPLE0 135 CNTHRU TREATMENT PLANT MEASUREMENT 50050 10 0 V.. -7WEFFLUENT GROSS VALUE , -ý",p- MGD'.-.- -- " "I. ... .' .___ _-"__"__-fEO IR"..7:"d D Y-A G ":I "..;"___

" .-~ ' ____"_._

__r". -. ...*"' * " "CHLORINE.

TOTAL SAMPLERESIDUAL MEASUREMENT 50060 1 0 0 -rtii 2 -.EFFLUENT GROSS VALUE,. ..A- ,-. ..-- ,, ..- Y ..."- .A.V.. ".. .DAILY U -.: .__'.HYDRAZINE SAMPLEMEASUREMENT

() (19) 5B1313 1 0 0 WHEN---R

...- ----..M-... .-DALYWHEN.

EFFLUENT GROSS VALUE -' -" " ...:--.-. LBS/DY -.o --; ..... A .GjNGNAME/TITLE I cearly under penaq dl taw toaftt doameit nW all afltafmits vwe pepared unWm my / -TELEPHONE

/',i. 08 DATEPRINCIPAL.

EXE WiVE OFFCER~ dmisonl or supemion in =wacoiaie with a systern desige to wsmr that qualfied petsuwnei I '~'- 17Tpwopely gatheraM evaue ft irdomatm wsednybquiyolftepersm orperzsoisi 616 406-3700 10Btcy Adas wo manwa ftm syuu or ftmoe pemam dfatyrsim mritile for On irom~mm.

ft B 01kdormatioi i. t fte b d al delef. u 1 and complete.

I am SIGNATURE OF PRINCIPLE Plant Manager wams tU thee are S-icailm p:enale florsuLxkiglathqfse mlolilsxt.

tllWn fthe pwlAt d EXECUTIVE OFFICER NUMBER YEAR MONTH DAYMEN OR PR"ad'w.o AUTHORIZED AGENT 100 NUMBER YEA MONTHCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (RsMhrence all alltachments here)Per Special Condition 4C.. te madimum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3199) SD PAGE I OFi NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 80655FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010I IL0048313 PERMIT NUMBER002 0DI7pSCHARGE NUMROCR0501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

.*. NO DISCHARGE MONITORING PERIODYEAR I MONTHI DAY I YEAR I MONTH I DAYFrom:I 0 1 8 I 0 I9 1 01 1To: 1 18 1 019 13 0]I I I ....NOTE: Read instructions before comptin this tormQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. QUENCYPARAMETER OF SAMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEPH SAMPLEMEASUREMENT 00400 1 00 :'*.-. "-9.: .." -.-.. " I .SEEEFFLUENT GROSS VALUE RED ,"MAN~ .NI." -'-'__.'

_- M -,. MAXIM"M .PER-MITSOUDS. TOTAL SAMPLESUSPENDED MEASUREMENT

-(26) (19)00li30 1 00 0' P.PMT-..' .. -'- oSEEEFFLUENT GROSS VALUE o.. IREME-"'Z

-"-' LBS/DY J.'"- -" ..- MG/L i PowITCHROMIUM, HEXAVALENT SAMPLE 2A)(AS CR) MEASUREMENT 1 19)01032 100 -PERMIT..

Y-,EFFLUENT GROSS VALUE :.E E -.,:..' >3-0AYAVG-

.' DAIY tX"- / ' ..DAL " R- SCHROMIUM, TOTAL SAMPLE '"(AS CR) MEASUREMENT 19)01034 1 0 0 21'3"-EFFLUENT GROSS VALUE -REQUI.REMENT

--: , ....... ,.."- DAILY G- " RAW__________.

-.3 7 WDAY AVG YA -MGICOPPER. TOTAL SAMPLE(AS CU) MEASUREMENT

.(26) (19)01042 10 1 LBS/DY 0 ...5 :7" ..0"..= -::-_ --'a)' o -v -tM,/L .... ,- D... LY GRA.'D. .- ----EFFLUENT GROSS VALUE -. lDAy DAILY MAX _ _ __IRON. TOTAL SAMPLE(AS FE) MEASUREMENT (26) (1)01045 1 00 o-"-ERWNT

"-:"' .... .-- ;:

... ." ..-.1.0-"°'DAI"LY-';".:

A LY .:EFFLUENT GROSS VALUE R.UIEMYT4Y.:

.MGI .-DLEAD, TOTAL SAMPLE(AS PB) MEASUREMENT

,2I (19)01051 1 0 0 L;:- :, .:.- T -:-1 '--,%ý- L .i".Y ° ......EFFLUENT GROSS VALUE r.E-;LSU*Y

.-'W--.- M G-v ;fD. ,Y L.._...__ _,__ __ _ _ _......:.

'. .NAMEITITE I caddfy ~ne pealty d law that Iha downenwt anid all aflachmeants were prepaed under my TEEHOE4EDT pWCIPAL EXEIVE OFFICER drecuc or eupeniso In s accofarce wioh a system designe to asstue thao quaied pemonnipmpe gather and evaMW fte VInlomaon sme Based onmy hqmy at the per" or pemars8Bl~radle J. Adarri who manage we system or ft-r persons d=*~ responsl for ga~e0 ft Inforna the v1i4a-7 08 1017inrmation sub*ifed is, to the best o my krnowledge ean l tree acmme, and wMt. I am SIGNATURE OF PRINCIPLE Plant Manager a the aamr sunificant penalties for sutbntingfalse the pOSSlity d EXECUTIVE OFFICER OR AREA NUMBER YEAR MO____ OR _nnM_ __e and ____fore W__V _ _-- I AUTHORIZED AGENT CODE MONTH I DAYCOMMENTS AND EXPLANATION OF ANY VIOLATnONS (Reference all attachments herm)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin dufnh the month.2. This dischare point was not used this month.EPA Form 332D-1 (Rev 3/99) SD PAGE 1 OF2a 0 *

0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DM:I)PERMITrEE NAMEJADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, 0160555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0046313 PERMIT NUMBERr -002 0DISCHARGE NUMBEROCRO501MAJOR(SUOR 01)F -FINALSTORUWATER RUNOFF BASIN OVERFLOWSTORMWATER

- - NODISCHARGE E] ...From:1 MONITORING PERIODYEAR MONTH I DAY YEAR MONTH DAYFrom:l1 0 1 a 0 1 9 1 0 f1 I To: 0 1 8 0 1 9 3 0I l I l " " "I_________________

I___________

________________

-NOTE: Read ins .s before conilefino this formFREQUENCY SMLQUANTITY OR LOADING QUANTITY OR CONCENTRATION No. FSAMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPENICXEL. TOTAL SAMPLE(19)

(ASNI) MEASUREMENT

(_8) _ _ (19)010o67 1 o

i,: .... .. '"0MCAIYEFFLUENT GROSS VALUE .RIQUIR2IENT A-AA GRAB.ZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT 2i (28) _ _19)----~.,LBSIDY

'v 1 -2. GI 'GRAASLYEFFLUENT GROSS VALUE AEOuIB"Eim;"-

' -w. " ' ": " ".. .. " DA... .A IL"..A....

.__... .. -OIL AND GREASE SAMPLE (261MEASUREMENT 28.(19) Soo03582 1 0 0 P i ,-' ; -LB Y , .. , .0, .0.0 .-. M211 ..EFFLUENT GROSS VALUE --.. 1 7.. 'E. 7, : --.6., -, -EDA. V DAILYMAX

.M NTH.FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT (03) -oo50050 1 0 0 ý z .~R- .1EFFLUENT GROSS VALUE.EDIBET

_____ ~ >l.- ,. ---.-I* TTAZs~oso o o -;: *=M- -'-" .." M-D :° * "-" , :-- "{ ;, MOT ---or .SAMPLE.MEASUREMENT SAMPLEMEASUREMENT

-,,-:'.. .: ,. r .-.,-4 ; '." : " : " " " -.." '..':. -"" -"- --' -.- '-.- .... -,..,.. ... .* .-.,,SAMPLEMEQUREMENTA kAMEMLE Icanny undar penatty of law VOa tea doomaent and aml attadwune ware pre~ared under myPRMALE)aM OFvFtCEF direcbia or aawerval in accaraý wfth a systern designed to amSre haw quajfad perssall TEEHN --?tj ATwedy gaths and evahteU ft mahnsuited.

ased an my U en g rsa ns 615 406-3700Bradley J. Adams Ao mUnaR tZe systeD O Owse pEM Duecdy r for gafhei0 te inft 143 08 10 17ifomtiUW sutniied is. to the best d my b&oWted awd beWief. true. accurate, and complete.

I am SIGNATURE OF PRINCIPLE Plant Manager aware at the -r aigrd aeaie aheida5mnIOrM.vclud the pmdosao EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYriMORPROn In and kvpnsonmen W or kn vwafinm AUTHORIZED AGENT CODEt-NME ER A0T ACOMMENTS AND EXPLANATION OF ANY VIOLATIONS aH atlaclunnte hem)EPA Form 3320-1 (Rev 3/M9) SD PAGE 2 OF 2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit EL0048313 September 2008BLOWDOWN TEMPERATURE MONITORING:

0Date09/06/0809/13/0809/20/0809/27/08Calculated MaximumAllowable BlowdownTemp. (Degrees F)120120120Maximum ActualBlowdown Temp.(Degrees F)82.192.289.188.7120Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of September 2008.TOTAL QUANTITY DISCHARGED:

TOTAL DURATION OF DISCHARGE:

N/AN/A0k:byrý_ch\byrundb\clcrk\MonthlyDMR\attachO I \SeptO8 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit U.0048313 September 2008COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 30 of 30 days.k:byt-ch\byrondb~cderk\MonthlyDMR~attachOI~eptOS EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-209/01/08 40 4009/02/08 40 4109/03/08 40 4009/04/08 40 4009/05/08 40 4009/06/08 40 4009/07/08 40 40HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 09/02/08Time: 10:55Analyzed by: D.C. A.Reviewed by: Z. C.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.0oF I I I I I I I I10.46 -"0.44-0.42-0.400.380.36 -0.340.320.30 -0.28-- -C- 0.26-C" 0.24 -0.220.200.18---0.160.140.120.100.080.06 ---0.04 .--"-- -0.0120.00-0255075100Minutes125150175 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I I09/08/08 41 4009/09/08 40 4009/10/08 40 4009/11/08 39 4009/12/08 43 4409/13/08 42 4309/14/08 40 40HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 09/08/08Time: 10:37Analyzed by: J. P.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. All values lessthan this limit are reported for information only.E01.0.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00II0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-_I09/15/08 40 4009116/08 40 4009/17/08 40 4209118/08 40 4009/19/08 43 4109/20/08 40 4009/21/08 40 46HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 09/16/08Time: 12:20Analyzed by: D. L.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. All values lessthan this limit are reported for information only.Eat.a.0 25 50 75 100 125Minutes150 EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-1 _09/22/08 40 4009/23108 40 4009/24/08 40 4009/25/08 40 4009/26/08 40 4009/27/08 40 4009/28/08 40 40HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 09/22/08Time: 11:00Analyzed by: M.P.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. All values lessthan this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26IL 0.240.220.200.180.160.140.120.100.080.060.040.02* 8.00-i- --10255075Minutes100125 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U_- I u-209/29/08 40 4009/30/08 41 46______ 4. 4.I* 'P4. 4.HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 09/29/08Time: 12:00Analyzed by: J. P.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. All values lessthan this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00-i0255075Minutes100125w Exelkn.Exelon Generation

Company, LLC www.exeloncorp.com NuclearByron Station4450 North German Church RoadByron, IL 61010-9794 November 19, 2008LTR: .BYRON 2008-0114 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #19Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number1L0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units I and 2. This report covers the period October 1, 2008 through October31,2008.* If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, BradlefJ.

AdamsPlant ManagerByron Nuclear Generating StationBJA/ZC/sdk Attachments

.. ote -Environmental

-CanteraZ. Cox -Chemistry

-Byron NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDESJDISCHARGE MONITORING REPORT (OMR)PERMITTEE NAMEIADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMfI NUMBERA01 0DISCHARGE NUMBEROCRO501MAJOR(SUJR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT.NO DISCHARGE EJ"I MONITORING PERIOD IYEAR MMoNTH DAY YEAR MoN l DAYFrom:I 0 I 8 I 1 I 0 I 0 I 1 I To: I 1 e I Io la ! Ia i i I i I INOTE: Read ins ctions efore conpletin this formPARAMETER QUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARMEER__,

OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS TYPESOLIDS. TOTAL SAMPLE 26) 0.9 0.9 (19) 0 285 ECSUSPENDED MEASUREMENT 005301 .. -L.5-. .-,-30.0 1 0 0 ONCFJ.EFFLUENT GROSS VALUE ' OREQUIEMENT;-

L.AL MONTHCHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT (19)01032 1 0 0 E .:.EFFLUENT GROSS VALUE -EQUM N" --- '-- .LBS/DY " -: 2. 0 -DAYAVG DAILY ,MX .; LGGACHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT 01034 100 0 7 7- 7=- -"" "EFFLUENT GROSS VALUE30_-

_ '"""_ ______"__

___ "_____ D .:. ..M,...BE ___ .___ B 4T .~DA.V. -'DAlp'YMAX-

---.-COPPER, TOTAL SAMPLE -)190(AS CU) MEASUREMENT 2_)_19)_500 01042 100 r" --"BS-DY .-J 0.5 0: .0- A-; L:._ .":AEFFLUENT GROSS VALUE REOUIP13AEN

..0 ."V-. M.'~-, L .--:. 'MAX" 7 .IRON. TOTAL SAMPLE-(26) =(19)50(AS FE) MEASUREMENT 2__1__o01046 1 0 0 7E~r- >......EFFLUENT GRS VALUE ________

MCA__ ~ .-3FyV( aya GRABLEAD. TOTAL SAMPLE(AS PB) MEASUREMENT (26) (19) 500010511 1 00 0. !?,-. -.. M .G/ PDGASEFFLUENT GROSS VALUE --REOQ.UR'-EN'

-..

...T-..-NICKEL, TOTAL SAMPLE -.-.-(AS NI) MEASUREMENT 1 26) 19) 50001067 .0.0.-._ -....... -- ,--. .LBS/DY .GI --DAILY -GRAM,EFFLUENT GROSS VALUE ..... ...... ... ..._-_ ;,!:,---

DV.'..X.-P MG&L ' _-: _y_._NAMEJ'mTLE c1/it ' cwter anat Of law 0a this mm and al anadlmnts were prepared under my / /PRIOCIPAL EXECUTIVE OFFICER disreon or m accordance with a system designed to assure MW qLad personnel

,TELEPHONE DATEpropey ga9r and evalul the uifonnamsuned.

Based nmy iqtuayd lte person or pernsa 815 40-3706 119Bradley J. Adams who manage the system, cr ese Persons direody response for gatheng the inronnatirc the 1 18011310Mal subritted is. to the boes dl my bnowlege and b9eW. rue, cacTopee I am SIGNATURE OF PRINCIPLE Plani"Manager tware wathe arsiant peoals for uo gtal dinonnat inudsg de, pmoy ol EXECUTIVE OFFICER OR ARA NUMBER YEAR MONTH DAYtWW on PflnTE -anti fox k~ s.AUTHORIZED AGENT O _DE_COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachmenta here)1. There was no discharge ot processed steam generator chemical cleaning waste water during this month.2. Flow existed 28 of 31 days during this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEJADDRESS NAME Exelon Generation Co.. _LCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4460 North German Church RoadByron. IL 61010lL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCR0501MAJOR(SUOR 01)F -FINALOEUINERALIZER REGENERATE (001A)EFFLUENT...NO DISCARGEI MONITORING PERIOD I[ YEAR MONTHI DAY I YEAR I MONTHI DAY IFrom:l 0 I Il11 o0o[- I~ To: 10 1 8 1 1 1 L L 0INOTE: Read instrctions before comoletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION No.FREQUENCY SAMPLEPARAMETER EX OFTYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISZINC, TOTAL SAMPLE 26) 19) 500(AS ZN) MEASUREMENT (26)_(19)_500 01092 1 00 7- -PERMI .. 1T7 a-llEFFLUENT GROSS VALUE --"EQL. .f ,>C LBS/DY ...AL" MGIL DALY:' ="" DA YFLOW, IN CONDUIT OR SAMPLE 0.023 0.091 (03) 0 135THRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 -~~j~ 1EOT REPORTz:.

MOD--- COWIN.A*QU. ME '0-AYAW7.DAILY CNIEFFLUENT GROSS VALUE -REO"lo&IENT' 3O-OAYAVG AAX M --'-".... -T Ax ... .---SAMPLEMEASUREMENT

_____________________

M G :---.-'-

! -PE .

D A LY " - N.N .-., .. ."., , '--. .."-'.-, i .."" __ .1 _SAMPLEMEASUREMENT

__SAMPLEMEASUREMENT

__________________________________

SAMPLEM EASUREMENT SAMPLEMEASUREMENT PRINCIPAL EXCUFIVE OFFICER djrecdtio or sijpennsion in accordance with a system desoged to asam arele quafefied persornnel prpet g~athe and evaLAIS the W00atioin sLxnmled.

Based on my ffqwayt ofdepro rpm 815 14008371Bradley J. Adams vwh menage the system. or thoe persorts directly respionslible for qathenlltl th mlornumto the 0 11inomiation submaed i. to the best of my .kod and bend true aommle. and comlet I am SIGNA E OF PRINCIPLE.._.

._.._,Plant Manager aware #Wa there are 5gnhilcant peafties fo I M falselin bled m taion. aied the possaiby of EXECUTIVE OFFICER OR ARANUBRYER MNT A____OR__________andbps-ramfor______violations AUTHORIZED AGENT CODE _________

COMMENTS AND EXPLNATION OF ANY VIOLATIONS (Re0ference ail attachments hemr).EP~rm3O1 (Rev 3M9) sD A&AGE 2OF2tw NATIONAL POLLUTAN@HARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DUR)PERMrTTEE NAME/ADDRESS NAME Exelon Generation Co., I.LCADDRESS 4300 Winfield RoadWarrenvifle, IL 80555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERB1o 0DISCHARGE NUMBER0OCR0501MAJOR(SUBR 01)F- FINALSIP EFFLUENT (FORMER 0018)EFFLUENT... NO DISCHARGE EJ"MONITORING PERIOD II YEAR I MONTH I DAY I I YEAR I MONTH I DAY I.'." : -lL -r i .... ..i .... iFrom 1 0 1 8 1 1 1 1 01V 1 jTo.! 0 1 8 1i 1 0 I I* JNOTE: Read instructions before cornltino this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY PARA ETEROF T PAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPESOD, 5-DAY SAMPLE " '(20DEG. C) MEASUREMENT 0.92 1.47 (28) --- 9.8 16.0 (19) 0 290 DC00310 1 0 0 ~ PEiR2.' -"".0 " 7- TWICEFFLUENT GROSS VALUE '-IREIREEN 0-DAY'AVG-

-LBS/DY -' :'30 DAY AVG "1DAILY MAX. --Q..M00TP,,

SAMPLEPH MEASUREMENT

--7.63 7.88 (12) 0 290 GR0040010 1.0 At P- e.O..0. TWIC.Iu .---EFFLUENT GROSS VALUE ; -E I-IA SU ' -"SOLIDS, TOTAL SAMPLE 0.68 1.14 26) 7.3 114 19) 0 290 DCSUSPENDED MEASUREMENT 0.68.1.14 (26) -73 124 (19) : 290 DC040530 1 .0 .. PE.MiT. .- .: : .z; 7.. LBS/Y '3000. TdIEEFFLUENT GROSS VALUE -.REQUR .'0DAY AVG AVGY:MA/

' -.--'-DAILYMFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.010 0.014 (03) --0 135 CN50050 1 0 0 f-EfT.~PR1

-~PrT,. --EFFLUENT GROSS VALUE *, .0,DAV- ., AY'coMGD#.

-_, ._ ...--- D:.XA -LY M a- aSAMPLEMEASUREMENT

__ _ _ _ _ _ _ _ __ _ *EU R M N :"" : -*"2:S'-

.... " -., -.". ' ' __ a ..-' .. -".- -" ':, : :- ! ': ": " : ':' -"'. ...' i.-.': : ."r :' -.SAMPLEMEASUREMENT SAMPLEMEASUREMENT NAMEMTLE I ceriIIy wider Wally of law Via dde docmwent and all affachmrswlul ere prepared under m~yI TELEPHONE DATEPRINCiIPAL EXEC4JIVE OFFICER drection at superwisimr in accowdajie withl a systemt tiesagd to eau-- MhA qualiffed personniei

___ -____Brdly .das who cranage ft system or those peso dircl repmbe -o -aUW -t -dft0 11mironabont aubmitted!

Is. to the begt of my laWtedg arnd befief, true. accuate and complete.

I em SIGNATLIE OF PRINCIPLE________

Plant Manager aware that dam are sqmicaidut peialfies for ardenilt" false hrtortnat ickn, ftl~ po~eAta ot EXECUTIVE OFFICER OR AREANUBRYA MOTDYai nd enpronwmnwt for slowin vioatiorm

NZa ER MOT ATYPED OR PROMe AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Raefenwce alt attachments hers)1 .Flow existed througha Oth outfall 31 of 31 days during the month.EPA Form 3320-1 (Rev 3199) SD PAGE 1lOFi1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (OUR)PERMITFEE NAMEJADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvide, IL. 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERCoi oDISCHARGE NUMBEROCRO501MAJOR(SUOR 01)F- FINALWWTP (FORMER 001 C)EFFLUENT"*" NO DISCHARGE I MONITORING PERIOD II _YEAR I MONTH I DAY j I YEAR I MONTH I DAY IFrom:1 0 1 8 1 1 IJ0j 1 To:[190j 8 11 0 1 K3] 1 1I...m I I gNOTE: Read instructions before comrletino this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS E AAOF TYPE< ANALYSISSOLIDS, TOTAL SAMPLE (26) 4.2 10.0 19) 0 240 DCSUSPENDED MEASUREMENT (2_) _ 420()2D00630100

.-1 -LB/Y -7 30.0EFFLUENT GROSS VALUE :.RE AT'-:. L " --" : 3QDAY.AVG.?

DAI.V I'-.., MG/IL WEKLCHROMIUM.

HEXAVALENT SAMPLE _)9S(AS CR) MEASUREMENT 00 32, 1 0 0 .... -_ ..... :... :' ý.°". ...EFFLUENT GROSS VALUE .REL' IY -." '"LY" M/.. ", , A ...AB01 32 00c:-"! "

I. lY -': 7--.T .--'A.Ii, -.0 2 -._ .---, .. ...CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT

-(19) 500013- 00v t0. --20-~010410 .. -.- LB/Y -7,O -- MG/L' -,AL- .GRAB:EFFLUENT GROSS VALUE : REQUIR1EMENT-:

,_,., _-- .,:- --DAYAVG;-

DAILy MAX. "'-COPPER, TOTAL SAMPLE (26) 19) So(AS CU) MEASUREMENT (2__ _(19)_500 LEPJT 7-- ------- _ M/.~ DAILY0 42 1 O o"- -; .. : .-

---,',.,,,

EFFLUENT GROSS VALUE :-P.EQUIREtENT.-.

---b .- --. _ --_ .m -t ., 6 " -.DAYAV&- .DALY -.. , MIRON, TOTAL SAMPLE(AS FE) MEASUREMENT

-(26) -(19) 50001045 1 0 0 .,,0RMW4.-- -..-IM/. -.;" DAILY.-

..-, _ IBS/DY -- .--- , -, --* 0 : , o. G .tEFFLUENT GROSS VALUE ..___ -- .- __-_. ... .... .. ..LEAD, TOTAL SAMPLE(AS PB) MEASUREMENT 01051 1 0 0 ALLY..~-,-~-'--'-~

-MG/I.DIY GAEFFLUENT GROSS VALUE Z..,- ..- .. 04 *____,-. .-._"__._ ,___._.__

__.- __" _,__ LBS3 D YA (. 'DYLY ANICKEL, TOTAL SAMPLE(AS NI) MEASUREMENT (26) 19__50001067 1 0 0B 2-0.0.. MG/...DAILY.GRAn,-msy .-. MO/L

GRAD:EFFLUENT GROSS VALUE -E EM ...... .-, --.. .DAAV D-OAILY MAX .-'-I... _-' .-.NAMEITI".E I cew under penalty of law tih' this docimen and al attactnerva were prepared under my / TELEPHONE DATEPRINCIPAL EXEcmVE OFFCER *Oectlon Or supeNIU m iccoldanmce with a system designed to aum eto ied persomnnel propert gther arid ewaluts fte informa~tion suftwited.

Owsed an my mqinry/ d he person or Bradley J. Adams who manage dosyem Or thouse peom diy resp__i__

for _aethe_____ft___on, ft 815 406-3700 08 11 19Irtionan subitted is. to the best ol my Mow,,edg and betief trme acurate, anrd comple. Iam SIGNATU OF PRINCIPLE Plant Manager area that there awxesirifican penanties for suWmW" i f false WtiOma iMtdekbrb fts pOSaWIly d EXECUTIVE OFFICER OR AREArdOOPFINm Iine andU fsiofeiorWoin viotatiom.i..

AUTHORIZED AGENT ICODE NUMBER YEAR MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)'1. There was no diaschaige ot processed steam generator chemical cleaning waste water during this month.2. Flow eidsted through this outfall 22 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SO ,EAGE I OF 2B NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERC0l 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALWWTP (FORMER ODIC)EFFLUENTNO DISCHARGE

( MONITORING PERIODYEAR MONTHI DAY YEAR I MONTH DAYFrom: 0l 0 I I 11 0 1 0 1 To:l 0 1 8 1 11 0 1 3 1 1I I l I I I IByron. IL 61010NOTE: Read insthctions before comvleffrs this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION No. FREQUENCY SAMPLEPARAETEROF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ALEX YSS TYPEZINC. TOTAL SAMPLE -1(AS ZN) MEASUREMENT500 EFLUN GOS ALE- .-~ -T'" -" -":"'".0""

"/" -""AL G* AS -""____,_.__

.--__-,_.-__

"_-__ .:30DAy.AVG

":,, DAIt.YMASX,

--0127.2 (19) 0 240 GR035"-8-2100-

-"-. M L .WEK.-:: GR-.EFFLUENT GROSS VALUE , 1EOUIIMENT'

""7 :"- --, -.S "i DAYAVG d DIYMAX. .. --FLOW, IN CONDUIT OR SAMPLEThRU TREATMENT PLANT MEASUREMENT 0.037 0.059 ( 03) ..-..-- "0 .135 TMEFFLUENTGROSS VALUE RE: UISAEN 30 DA AVWV '

MGD

.:; ;-- .--.,- .--. ..--SAMPLE'MEASUREMENT AiEO- Ri: -- .-.. ... .... .. 11 0 0 i .... ...SAMPLEMEASUREMENT SAMPLEMEASUREMENT "44- ý""1T A"° T"MEASUREMENT NAMEMIT.E I certify under penalty of law do es eocuner' and an a=nhe wer prepared under nrn J/ TELEPHONE DATEPRINCIPAL EXECUiVE OFFICER directlo or supemsion in accordane with a systen desie to assure &haw quafed personnel poerly 9gter and evalute the infonration Based amy of the person or personsI.,____815 406-Bradley J. Adams who manage the sysem, or mese person dm*y responsbe lor gameing me ndonmaton, me S A E PN .08 11 19irdonmetiOn sbui is. to mhe best of my Igwdgeiad

, an .a and complete.

I am SIGNATURE OF PRINCIPLEain Plant Manager aware that Vhere are sig-cam penalties for sutiniftg talse information.

Ickxkg the posswft of EXECUTIVE OFFICER OR AREAiw w line and flfllslloment a f or W vzatring

s. AUTHORIZED AGENT CODE NUMBER YEAR MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reterence all adwlunenta hem)EPA Form 3320-1 (Rev 3199) SO PAGE 2 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 WinfaId RoadWan'enville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERD01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 001D)EFFLUENT** NO DISCHARGE

-- ***I ...MONITORING PERIOD IYEAR MONTH DAY I YEAR IMONTH DAY IFrom:1 0 I 8 I 1 I0 I 0 I 1 1 To:l 0 1 I 11 1 0 1 3 I 1 1I I i i I I II I I I I i INOTE: Read instructims before completino this formQUANTITY OR LOADING OUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPESOLIDS, TOTAL SAMPLE ISUSPENDED MEASUREMENT (26) c 0.4 <0.5 (19) 0 240 CP0 M 1 0 a .-P "..--' ° ""-' " ":.:- w ' r " -"; i 15.0-: .I =.3 L' -'. " .-" *WEEKLY',":(;OEO.

EFFLUENT GROSS VALUE .GtIREMENTr

.. -_"" " " _ --. " 3.0AY .V.. -.A30PJAX MOwL WEE.LY ". M..SOIL AND GREASE SAMPLEMEASUREMENT (26) < 2.9 6.5 (19) 0 240 GR03582 1 0 0 V U " R IT -- L.BSDY .- .... ... .D'M ,GI -. WEEKLY. GRAEFFLUENT GROSS VALUE .."REjQf D.- -: __-_"_. --- _____!_.'

SAMPLEMEASUREMENT 002 (301___________'REOUIRI4N'

.3D DAILY~ -SAMPLEMEASUREMENT SAMPLEMEASUREMENT 777tPER4ft

-.**.7r 4-, _ -.. -.. ---- -.-.SAMPLEMEASUREMENT

':PERMIT-

--... -.....__ __ _ __ _ _ E I iE- .. -....., , ; :. ...'..- ,- ."r; ..;NAMEITI1 I Candy wster penalty c lawv tria ite dovna asli all attathmarit wvere prepared under myPRNCZPAL Ex)cQnVE OFFICER dreceui or suprwm in awoaccdance wuh a syte uesgnetoamr vis --.prsone TELEPHONE

-DATEBradley J. Adams who manage the system. ort the pesons directki responsile tr gatlle toe iformation.

the o-65 08 41 19mfomab submted is. to tia best oi my and b"t. trine aco1ate.

and tosmte. aim SIGNA tME OF PRINCIPLE Plant Manager aware tiat there are snicant penatieos for stitv ag se a iain udn the pos.sily al EXECUTIVE OFFICER OR AREAT7P .vro1PW -it anm f-lSorm kvb vitaio AUTHORIZED AGENT CODENUBRYA MOTDYCOMMENMs AND EXPLANATION OF ANY VIOLATIONS (Retftmtce all attachment ere)1. Flow elsted through this outfall 10of 31 days dunng the month.EPA Form 3320-1 (Rev 3/99) SD GE1OF1aU-NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313

-PERMIT NUMBERE01 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F- FINALSTORMWATER (FORMER 00liE)STORMWATER

- NO DISHARGEI MONITORING PERIODIYEAR IMONTHI DAY I YEAR I MONTH IDAYFawn:1 0 I 8 I 1 I0 1 0 1 1 ITo:1 0 1 8 1 1 0 1 3 0 1 1NOTE: Read instructions fefore cc tel , mis tormQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

_____T__PEO AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEPHSAMPLE

-(12) 500MEASUREMENT

____(_ 2)_50000400 1 0 0 -. -.- --..0... ..9.0- .SEE R-.:_______ INIMM MAIMUM SUEFFLUENT GROSS VALUE 'REUIREMENt-MA__ uMSOLIDS, TOTAL SAMPLE 2)) 500SUSPENDED MEASUREMENT 19_00630 1 0 0 .t'030.0-MG-i- SEE- ' R"EFFLUENT GROSS VALUE "REQU1IREMENT ," '..- .- 30 DYAV qD l I'X --- PE......-

CHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) (19) 5000 1 0 3 2 1 0 0 0- "P E R W. : -... .D Y.. .... ...--: -:"G"EFFLUENT GROSS VALUE -' -. '" ""30:DAY AVG -'AILYMAX"-*

-"CHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT 01034 1 0 0 ..0.BI~~.EFFLUENT GROSS VALUE -EQPMIREENT

-.6 0 *.- -Y -DAILY-' *.'- " "-"" 3'-DAY ;VG'" ,AL ,~ .MGI , .-, ' DA'LY -,.G" A"COPPER. TOTAL SAMPLE(AS CU) MEASUREMENT

28) 19) 50001042 1 00 300AYAVG "MIMAX .:MG/y. ":. 7DIY". GREFFLUENT GROSS VALUE DAILY-K'"

":-...LBS/DY 00IRON, TOTAL SAMPLE(AS FE) MEASUREMENT (19) S00014 10. .... .. ...~-- .*.LBS/DY10M/

DL -,,.. -.GRABEFFLUENT GROSS VALUE 'RQIEET ~-30 OAV'( AVG -.-AA Y).tAX i-- ____LEAD, TOTAL SAMPLE(AS PB) MEASUREMENT (25) (19) 5001051 1 0 0 ~ -P~EFWr' 0-7.EFFLUENT GROSS VALUE -:aET. LBS/DY 7. 30 PA:" .'." "GANFHMAL EXEC E FFERI cetfwy under PteattY of law tha V&i doommrWi and aut afttSdhuents were prepared under rny TELEPHONE DATEPRINCIPAL E.ECUIVE OR1CIER atrecbn or asu n In accorance wiM a system designed to assure tht qualifm property gaher and evaue the lWiantlion suwd Based on my kiqu 0 tie person or personsAdams who manage fe s-rasw, of tose pe directly respoasUe tor gahering the irtonnauon.

me 08 11 19tmBaadl e As. to te ysU of nq knowWF and beey, true, eurm, and cAmpsmte,

.amn SIGNATUI OF PRINCIPLE Plant Manager aware thaw eare agCa pafte fWrSorrnVfalse g e knctuin oesifey EXECUTIVE OFFICER OR hREA NUMBER YEAR MONTH DAYrDlWeaat fe arid inaminer fr W vitae. AUTHORIZED AGENT COD NUMBE YER _ONH_ ACOMMENTS AND EXPLANATION OF AMY VIOLATIONS (Reference all aMlgchmenta here)1. No Turbine building wastewaler was discharged t the Stonmwater Runoff Basin during the month.2. There was no discharge of processed steam generator chernica Cleaning wastewater during the month.3. Flow existed through this outfal 12 of 31 days durng the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 21 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (OMR)OCROS01PEPMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBERIE01 0I DISCHARGE NUMBER IMAJOR(SUER 01)F -FINALSTORMWATER (FORMER 001E)STORKWATER

- - NO DISCHARGE EJIMONITORING PERIODI YEAR I MONTH I DAY I I YFAR I MONTH I DAYI " -[ -.--II -- -II --I ..... I --. -IFrom:I 0 I I 11 1 0 I 0 I 1ITo:1 I 8 11 11 0 3 I 11NOTE: Read insruclins before completin this formQUANTITY OR LOADING OUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISNICKEL, TOTAL SAMPLE 25) 19) 500(AS NI) MEASUREMENT

_ .._..___o010671 0 0 ,2: 0'r;>.-:-:

-' L.S.DY-10

.*.0 -MG/ .-DALY GRAD.: ~T L" : .. : / "' -" IBS/DY _;:' ..'- ---AV-:.. _.._ Ay- .. .i, ,::s,,--

-'"- , .EFFLUENT GROSS VALUE -EiUIREMENT-DAI.YMAX

.YZINC, TOTAL SAMPLE (26) -)(AS ZN) MEASUREMENT 01092 1 0 0

-. " --LBS"DY -........

""- ..-

...- ; °, --. --_ l St:Y : -: .. .. , ....- ,.0 MG/I. ..IY .* : EFFLUENT GROSS VALUE DAYSAMPLEOIL AND GREASE MEASUREMENT

(26) -1.9 24 (19) 0 290 GR0356210 0 '-P)ERMIT

.--<LSY -r15.0- 7. ~TWIM.'EFFLUENT GROSS VALUE RE.UI " "13':-- "- .... .. MONTH -FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 REPORT :..PORT -. M -.--, ....... ." " ..WICE-. TOTALIZ.EFFLUENT GROSS VALUE .EU IREMEN V0,A'AVG

!DA1LY#AAX MGD 'N. ' " ---" " OThSAMPLEMEASUREMENT MEASUREMENT

____________

.8- .-.-. .,. ... -, --...:-.N;:=- *- .-SAMPLEMEASUREMENT F-Zia'. L -:-p...g:-

.:: :.. .-0 .; ..":.. -; -"." .",: -.-... _' : , " :-' .. ," ""-NAMEMfLfE I cenitf under Penalty d law #0thi at t fe Me arid alt Walamitnla were pwreald uOWeri TEEPyN DATPRINCtPAL EXECTIVE OFRCER dmxo rsvriwI oocao i a syte TELEPHON to DATEe 19 ub esneBradley J. Adam womstg h Systm. fd~ aOM ~tyCe~pymSil p aidN f 11 Usis 463 00 11 19Womtcation submawec is. o the b~est of my Jwwl edge and befsesuu.

temawume.

andi comptlete.

I amt SIGNATURE OF PRINCIPLE

________Plant Manager aware Meat #wee awe sdagrdtsn itenafties tr vAumIftvi Mae utnadamum vkcdNg the Posify d EXECUTIVE OFFICER OR AE UBRYA O~ AWYPM OR( PPUNMn fin and Wpwrdfrwwh wx AUTHORIZED AGENT CODR MONTDACOMMENTS AND EXPLANAXION OF ANY VIOLATMOS (Reisserm a all a ahennia huer)EPA Form 330- (Re 3M9) SD giLGE 2OF 2AW NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES:DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 WmIniek RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4460 North German Church RoadByron, IL 61010IL048313PERMIT NUMBER001 0DISCHARGE NUMBERI MONITORING PERIOD II YEAR I MONTH I DAY I I YEAR I MONTH I DAY IOCROO01MAIOR(SUBR 01)F -FINALCOOLING SYSTEM SLOWDOWNEFFLIENT... NO DISCHARGE ED ...I --- .. ; I ---Fromj 1 01 11o10 01-1ITo:1 0 1 8 1 1101 3 11 IINOTE: Read instsctions fare comotetinafliS formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

' UT OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH8.52 8.69 (12) 0 240 GRMEASUREMENT 00400 1 0 0 J,- su -::7 WEEKLY ,GRABEFFLUENT GROSS VALUE ;jEIIIR&ET 4 --_ _ _ _ _ _ _ _COPPER, TOTAL SAMPLE 26) 0.016 19) 0 240 GRI(AS CU) MEASUREMENT (B -.1 1) 020G100-4. 1 0.0.. .EFFLUENT GROSS VALUE 'QI ..,-:--.. .--MG__"_."_WEKY-_"__:.DAILY MAX--ZINC. TOTAL SAMPLE 2.94(AS ZN) MEASUREMENT (26) 0.046 (19) 0 240 GR01092.1.0.0

....G -"WEEKLY GRA- -..EFFLUENT GROSS VALUE ! UI ] N `1 "A ."OXIDANTS, TOTAL SAMPLE -1RESIDUAL MEASUREMENT 34044 1 0o 0 7o .. ...' .. ..EFFLUENT GROSS VALUE -.RE UIR E --._ -' '-- .. : L DY .. .. ..... : -.... ... ,,FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 17.36 2767 (03) -... 0 135 CN50050 1 0 0 3F Mý-- REPORT.'I M RPR- GD-.o o. -30 .AA,-. D..LYj ..... -.DAILY7:

C.-11:EFFLUENT GROSS VALUE ..'REQUDiiIRE0 A .' .."_.......

."._-" :_ ..' __.:".CHLORINE, TOTAL SAMPLE-RIDUA MEAME- (26) 0.12 0.47 (19) 0 240 GRRESIDUAL MEASUREMENT 50060 1 0 0 L-E ..: -.-----02.05.--EFFLUENT GROSS VALUE : IREMET0&w

' ...... L. S Y .- ..DA. WE* LY.' *GRAB -SAMPLEHYDRAZINE MEASUREMENT (26) --19) 500.... +... .. .... .._. .... .. ..... .......--.

ýY W E61313 1 0 0 LBSIT-'.

-G/- as" AIYWEEFFLUENT GROSS VALUE .%REOU1R N "--i- -: " " " ..,.: .. ...00W." -CNLNAIW~rTLE I cear*y under penafty of law ta this documri and all attadcments were prepared under my TELEPHONE DATEPRINCIPAL EXECLIVE OFRCER dction or sui in amordanie a syst desiag to assure dtoafjdied personDel pmrpeft and evaklte the infomati suoied. Based an my klql'y of the peson or pemrs8aBradley J. Adams who manage the system, or those persons dwrecty responsible Ifr gatherimg the fonmation, te 808 11 19iloohation submied Is. to the best oi tiny Wledg and bebet, aCoie. and complete.

I am SIGNATURE OF PRINCIPLE Plant Manager aware tat nare are aignSfcan penates for Oirlnitng Walse knfwmaion, "1 the pMSaby Of EXECUTIVE OFFICER OR ARE NUMBER YEAR MONTH DAYOIMCNIPRo"M fine and imbin12t for mwing vitlations.

AUTHORIZED AGENT CDECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Refeirne all attachments heae)Per Special Condition 40., the maidmum allowable blowdown temperature calculalton results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF1 NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCR0501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenvue.,

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IPI0043MN3 II I002 0i PERMIT NUMBERI I DISCHARGE NUMBERMO MONITORING PERIODY I0NTHI DAY I I Y IMONTHI DAYMAJORS (SUBR 01)F- FINALSTORMWATER RUNOFF BASIN OVERFLOWI STORMWATER

... NO DISCHARGE From:l 0 I a 1 1 10 1 0 1 1 TO:I1018 0 1a~ 3WT 1F1NOTE: Read instructions fore completin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH SAMPLE 12)MEASUREMENT (1)SEE00400 1 0 0 :-'I -..-.EFFLUENT GROSS VALUE -".EQUIRIMENT K -T7. .U :" " " -MXMM- SU -7 PSOUDS. TOTAL SAMPLE -SUSPENDED MEASUREMENT

-(26) (19)00530 1 030EFFLUENT GROSS VALUE LBDY 30: 30.0 -'PEECHROMIUM, HEXAVALENT SAMPLE 2__9(AS CR) MEASUREMENT (19)4 77. -. r ...01032 1 0 0 .LBS.DY I '- .- MG.L DAILY..G.

EFFLUENT GROSS VALUE 1E8159wE.

,.. o.. -3.*'A 7, -M'-AVGDA l- .AX"-_...._-.

CHROMIUM, TOTAL SAMPLE 2__9(AS CR) MEASUREMENT (26) (19)01034 1 0 0 PRMSFI: DAL,EFFLUENT GROSS VALUE fE-- ..... ,...:'DY

-- 10 _.0' -MGIL "- ' DAxLY .....COPPER, TOTAL SAMPLE _ 19*(AS CU) MEASUREMENT (26) (19)01042 1 0 0 -1.0.:'oi~100--~LBS/Y Z.IY MGIL -- DAILY GRABEFFLUENT GROSS VALUE OR T " .--." -i. --". -, MAX.MG/L',-'

IRON, TOTAL SAMPLE __)(AS FE) MEASUREMENT (26) (19)01045 1 0 0 M: ~ERtri7 _ -- LSDY .-PA1.)- M1.YEFFLUENT GROSS VALUE "-RO REM---.;

'.- ..B,"- "" Y'0-DAY AV%* DAILYMAX".

.G L ..Y A l I GRA-LEAD, TOTAL SAMPLE(AS PB) MEASUREMENT(26)

(19)01051 1 00 .-0.2~-0 -EFFLUENT GROSS VALUE RE M"UfIREMENT

--_- BD I -AG ; MAX.NAMEfTIT/VE

-I cer ify L og pwenmsy d law ihat Of doc a and alW atiad't al we r e prepared under my TELEPHONE DATEPRINCIPAL EXECUTNE OFFICER direuion t cconiance with a system d to assure mat quaftd personelT property gae and evra me info4n subimsed.

Based on my bq/iir the person or personsBradley J. Adams who manage Ue system, or throe pesons direcily resporie for gathevng ue inlonnation.

me 815 6-3700 11 19information sutramted is, to the best of my knowldge and belief. ue. acste. and complete.

I am SIGNATI!RE OF PRINCIPLE Plant Manager aware ta tr are sigiiant penafles for aubng tabs entati. wctdkthe poesilby al EXECUTIVE OFFICER OR AANUMBER YEAR MONTH DAYMW OnR Rand AUTHORIZED AGENT COD NUMBER YER _ONH__COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachment.

hre)1. No Turbtine building wastewater was discharged to the Stormwater Runoff Basin dudng the month.2. This discharge point was not used this month.EPA Form 3320-1 (Rev 3/99) SD OGE1OF2SW NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERM17TEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winlield RoadWarrnville.

1160555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER[ _ 002 0DISCHARGE NUMBERSOCRO501MAJOR(SUBR 01)F -FINALSTORMIWATER RUNOFF BASIN OVERFLOWSTORMWATER NO DISCHARGE r ...MONITORING PERIODYEAR I MONTHI DAY I I Y MONTH DAYFrom: 0 1 8 1 1 0 1 0 1 1 To: 0 I 8 1 0 31! ....! IL I I I I I INOTE: Read instructions before coms ein hslormPARAMETER QUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS TYPENICKEL, TOTAL SAMPLE(AS NI) MEASUREMENT 01067 1 0 0 PEMT 0.20DL EFFLUENT GROSS VALUE .AE iL1-. .--- -' D "-- -- .-

" DNILY.MAY

' MG" " -- -,ZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT

-" -(26) -(19)01092 1 00 7PEIT'. --... -.- 2.0 .A'GA.:-: -: ... '--I- M ":"-tEFFLUENT GROSS VALUE .--REOUR -' -;J '---30-DAY:A-"

.Y-,SAMPLE 26)OIL AND GREASE MEASUREMENT

-26 .('M")03582 1 0 0 F"MIT -B/D M/.-* IEEFFLUENT GROSS VALUE -E.UIREMENT.

_________Y-"-K:3"DA15"O"'

.'AL1MAX-FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT (03)50060 1 0 0 ,,.- a. ,. :"T "-"" "MD" -". .... ""- ----: ""..ICEJ...-"TA"AZH EFFLUENT GROSS VALUE 3 AD A ._MEASUREMENT_____

________________

SAMPLEMEASUREMENT-

-- -- ------ -----(IRMET ;:":";" "":";""

SAMPLEMEASUREMENT SAMPLEMEASUREMENT____

PRINCIPAL EXECU'IVE OFFICER dirmcon or superbmn In wwh a system designed to wane Ito pemrsnnh

.,.property gather and evaJkvft oe omkiba subMncad.

Based m my bOaW y of the persn or perss o815 406-3700 01Bradley J. Adams w manage me sywm. or #0m06e pesms dmly Msaponsi for 9&mN the nm the mPLE406-3700 W fmiatmaon Is. to the beso of my eiowdge and betef. bIue. accaume.

and complete.

Iam SIGNATU OF PRINCIPLE 0 1Plant Manager aware hal more are sgnlicant pendams or at EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTHOR m~mB) nti aml ornIng',o, vitlals.

AUTHORIZED AGENT COD. _COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments her)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit 1L0048313 October 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)10/04/0810/12/0810/19/0810/25/0812012012012078.790.073.477.7Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of October 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byr..ch~byrondb'.clerk\MonthlyDMR~attachOI\0ctO8 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 October 2008COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.k:byr-chkbyrundbklerk\MonthlyDMRýattach0lOctOg EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

(Minutes)

U-1 U-2 U- _ U-210/01/08 42 44 10/08/08 35 010/02/08 40 40 10/09/08 35 010/03/08 40 40 10/10/08 25 010104108 40 40 10/11/08 38 010105/08 40 41 10/12/08 37 010/06/08 47 4010/07/08 35 0HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 10/06/08Time: 10:07Analyzed by: M.D.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26C1 0.240.220.200.180.160.140.120.100.080.060.040.020.00* I l I I1-nun-:: =iI -j' Zn---------------------

I I I---------------------------

-..i ..-....I...I [CI0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-210/13/08 30 010/14/08 30 010/15/08 30 010/16/08 31 010/17/08 37 010/18/08 37 3010/19/08 30 30HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 10/13/08Time: 17:35Analyzed by: M.D.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.Ea.C.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00025 50 75 100 125Minutes150 EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION 0Date Dosing Time(Minutes)

U-_I U-210/20/08 35 2210/21/08 30 4010/22/08 25 3010/23/08 26 2610/24/08 27 2810/25/08 25 3010/26/08 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 10/22/08Time: 10:00Analyzed by: G.N.P.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26C 0.240.220.200.180.160.140.120.100.080.060.040.020.00" KI. .- .------.-i ----. ---._____-~!0255075Minutes100125*W EXELONBYRON STATIONPermit 110048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes) 10/27/08 25 2510/28/08 25 2510/29/08 25 2510/30/08 25 2510/31/08 25 26HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 10/27/08Time: 11:53Analyzed by: M.K.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26CL 0.240.220.200.180.160.140.120.100.080.060.040.020.000-' -' If- -0255075Minutes100125150 Exekln.Exelon Generation Company.

LLC wwwexeloncorp.com NuclearByron Station4450 North German Church RoadByron, IL 61010-9794 December 16, 2008LTR: BYRON 2008-0122 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number1L0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units 1 and 2. This report covers the period November 1, 2008 throughNovember 30,2008.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley AdamsPlant ManagerByron Nuclear Generating StationBJA/ZC/sdk Attachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (OMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCR0501MAJOR(SUMR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT* *

NO DISCHARGE I MONITORING PERIOD II YEAR I MONTH I DAY I I YEAR I MONTH I DAY IFrom: 1 0181111 1 l 01 To'I 0 81 11 1 313 0 1NOTE: Read insrctions fore completi this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS. TOTAL SAMPLESUSPENDED MEASUREMENT

.... <0.7 <07 (19) 285 EC00.30 1 0 0 T 7. .C-.ET" :- 15 ".303 .-ONCE/--ID MG/L .CU-I~~~: Y AV -.EFFLUENT GROSS VALUE -REUIREMENT

-!.BS/DY MAX -CO"P,CHROMIUM, HEXAVALENT SAMPLE 26) ()0(AS CR) MEASUREMENT 12_) (19) Soo01032 1 00 0 PERIT--.

--- ,.-'". ... .0.2. -GALY... ... .....-:...:.: :.. :. LBSIDY .' ..y A _-- ; .y M SX '. M G /LI: : N Y :: : .iEFFLUENT GROSS VALUE DA-'-L,-Y

....~ ........-

< ... ..A M, " " -" "AS.CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT

26) (19)50001034 1 0 0 E r -. .. .: .2.0EFFLUENT GROSS VALUE hECLIREMENT --3.D:Y.....QA--YMAX"MG..

..-. DAILY -*A"COPPER, TOTAL SAMPLEPETOASAPE

---(26) -(19) 500(AS CU) MEASUREMENT 2_) 5000 1 0 4 2 1 0 0 aP' R , IT,- -0. ,S / Y -., 0- 7 -EFFLUENT GROSS VALUE REQIRE .. -_,.__._--

DAY AVG... DALY MAX MG/AILY.GR IRON, TOTAL SAMPLE(AS FE) MEASUREMENT (26) (19) 500MG/46 1AL 0- GRA-1B-Z010 0LBSDY -.0 -:-. x -* -..EFFLUENT GROSS VALUE --30 DAY AA XLY.LEAD, TOTAL SAMPLE -.-2 )-(15(AS PB) MEASUREMENT NICKEL. TOTAL SAMPLE (2)191 50(AS NI) MEASUREMENT (26) Y19) 50001051 1 0 0 -;.:Hp dT-: -.0- --.:'" ':' .. ... " ";EFFLUENT GROSS VALUE '.REQUIREMENT1..

,"-, ..,"--- ,__ .-.r'- 30.AAMG.I

, DAILY.. G- 0...NAMFJTITLE I ceruly Under penaa of law that ItIs a."d ait ait~d'inatls WerB Pn~l2Id Un"der Cy J/, TELEPHONE DATEPRINCIPAL OFFICER direcdon or supevao in acdac with a system daane to alawe that qualitied pelarenel

______Bradleyanea J.h Adamsn n-.. a eonyi~uWt~eero~xemn

,-815 I06-3700 0 21* B'dteyJ.Ad=ms who manage the systere, or three peisan direisly repisb 1 gathering the uotl~onai the 0 21Inormiation submitted is. to the best of my knolege and be~ef, trete. accurate, an capiete ln SIG NAT I -F E OF PRINCIPLPlant Manager aware that there are sigiicn penalties fo sutitain talse inlomtation.

indng thre posis of EXECUTIVE OFFICER OR ARIEA1 NUMBE YEA MOTATYE fne and impsnter for kI-ite violatios.

AUTHORIZED AGENT CODE NUMBER __ONTH_ DAY__COMMIENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attacltments hum)1. There was no dlischarge of ptrocessed steam generator chemical cleaning w;aste water during this month.2. Flow exdsted 29 of 30 days during this month.EPA Form 3320-1 (Rev 3/99) ' "SD PAGE 1OF2-NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEJADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCR0S01MAJOR(SUBR 01)F- FINALDEMINERALIZER REGENERATE (001A)EFFLUENTNO DISCHARGE I MONITORING PERIOD IYEAR I MONTH I DAY I I YEAR I MONTH I DAY Il

I I II I -.I -.-- IFrom:I 0 I I1 I [ 1 .= n1 To:1 0 1 8 1 1 1 3 1 0 II l , I I IByron, IL 61010NOTE: Read instrctions before coaDletino this formFREQUENCY SMLPARAMETER QUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. SAMPLEPARA ETEROFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPEZINC. TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19) 50001092 1 0 0 -RAB-" 1 .Us=. .' DAIL.Y-:

'-.--c ':EFFLUENT GROSS VALUE -REQUIREMENT:

i'. _- ".:LS.D -DAILY'MAX MG/L , AL .RFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.041 0.114 (03) --0 135 CN50060~Dl~

1 -EW"REPORT-,

50050 1 0i0 -.".",fP .ERM:-.-,

, MD '-"""'".

... "- ........,'" "" ,. -DLCfNEFFLUENT GROSS VALUE I7.7..4.W..

--.." ""SAMPLEMEASUREMENT SAMPLEMEASUREMENT_____

PERM.IT.

-.....,REQUWIr-EMEW

_ _ _ _ __SAMPLEMEASUREMENT_____

_____________

~EOUREMENT-

'____SAMPLEMEASUREMENT SAMPLEMEASUREMENT

__~ RMEAUIREMENT__

NAM~~rL I Crtiy uner enafy o lawMidthsdocument andl all at chents were pepared under my TLPOEDTPRINCIPAL EXECuTIVE OFFICER direcion of slvaaou¶ m inaccortiance with a sytemesogneti to asw *. quafitl TEEHNEDTpropet gainer and esaflue the itionnaliou submitted.

Based on my vmque of the persorio ein ____Bradley J. Adams who manage the system. or eoe pe"s. .or gathetf:tg the informatio"

". th-e Iintormaton submnitted is. to the best of my Irliwledge and befiet, true, aocutate.

antd compiete.

Iem SIGNATURPF RINCIPLEPlant Manager awame tha there ame sigifcant penatties for &&w"itin fatse information induding the ponaiiliy of EXECUTIE OFFICER OR AREANUBRYA MOTDY, O o e and inpgonrenmt for kn.. ng .w AUTHORIZED AGENT C NOD BER _PHN MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hemo)EPA Form 3320-1 (Rev 3M ) SD PAGE 2 OF 2]

0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMrrrEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 6055FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERB01 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTP EFFLUENT (FORMER 0018)EFFLUENT... NO DISCHARGE MONITORING PERIODYEAR IMONTH DAY I I YEAR IMNTH DAYFrom: 8 I 101.1 lo0l I To:10 8 1 1 3 1 0o]Byron. IL 61010NOTE: Read instructions fefore oomolefin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

.EX, OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOD, G.CAYMSASUEE

< 0.10 <0.10 (26) <2.0 <2.0 (19) 0 290 DC(20 DEG. C) MEASUREMENT_

00310 1 0 0- PER IT

.30"0 G-OD .-

., -.,,_ pEMT;,.-4.~-

85 LBS/DY --- GLCOMP24EFFLUENT GROSS VALUE REQU M 3OAYVQ, -30 DAY AVG DAILY MAX ,. ..._ONTH..PH SAMPLE--

-7.25 7.47 ( 12) 0 290 GRMEASUREMENT 00400 1 0 0 -6=-P0r'-:::'"

-9.0 .TWICE/EFFLUENT GROSS VALUE MMAXIMUM

-, MONTHSOLIDS, TOTAL SAMPLE <07 0.8 (19) 0 290 DCSUSPENDED MEASUREMENT

< 0442)8i 09D005P4 1 0 0 --12" [7 ,28.5- -"°.."TWICEJ EFFLUENT GROSS VALUE REQUIREMENT DAY AVG Ly __ AIM-TtmFLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.005 0.008 03) 0 135 CN5005O 1 0 0 .1::eMIT.

Im:lo L:

',-'O EFFLUENT GROSS VALUE ;-., E ",.--I4T 0AYAVG: .AY G:" -.. DAIL CO.T.SAMPLEMEASUREMENT_

.R " """SAMPLEMEASUREMENT SAMPLEMEASUREMENT I certify wnder penaily d law Meat thus docauent arid all attacLtmres were prepared uider my TELEPHONE DATEPRIfNCPAL EXECUTIVE OFRCER dimmCan or supervison in accordance with a System des~ied to assTEe LP quaOied peDproperty gather and evalute te informau submatted.

Base on my emqiy at the persanp'rons T -Bradley J. Adams who manage te system. or those persons diecly respyoisb tortgaherng the crdomatr, the :/: OF5 406-3850 08 12 16kIformation is. to the best at my keowledte and belief, rue. accurate, and cowrnpee.

I am SIGNATUr1OFPRINCIPLE Plant Manager aware that there are sigrnficart penaeties for su5ntibt; Ubse WaormaIn.

aidudinti the possbity of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPW C Pa5 ad Ereo~tiet I- V ,,,is. AUTHORIZED AGENT CODoCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hoe)1. Flow existed through this outfall 27 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (OMR)OCROS01PERMTI"EE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4460 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERCoi aDISCHARGE NUMBER IMAJOR(SUBR 01)F- FINALWwITP (FORMER 001C)EFFLUENTI MONITORING PERIOD II YEAR I MONTH I DAY I I YEAR I MONTH I DAY II

I *l II l t lFrom:! 0 ! 8 J 1 1I1 0 1 1] To: 1 0 1 8 1 ~ j 1 6]131 -* * "NO DISCHARGE

...PARAMETER QUANTITY OR LOADINGI ~ ~ I IAVERAGEMAXIMUMUNITSI I I-SOLIDS, TOTALSUSPENDED 00530 1 0 0EFFLUENT GROSS VALUESAMPLEMEASUREMENT1 (26)LBS/DYRECOdNTý I.'CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT (26) --10.32 1 0 0 "-." LBS/DYLBW-EFFLUENT GROSS VALUE N ..CHROMIUM.

TOTAL SAMPLE(AS CR) MEASUREMENT 01034 1 0- -'- '0 ,-EFFLUENT GROSS VALUE *J -Oý-RE. LBSDYCOPPER. TOTAL SAMPLE(AS CU) MEASUREMENT (26)01042 1 0 0 ~ EW~-LSDEFFLUENT GROSS VALUE LEM .-IRON, TOTAL SAMPLE 2_)(AS FE) MEASUREMENT(

01045 1 0,0 *.PERMIT

-"....EFFLUENT GROSS VALUE -- .LBS/DYLEAD, TOTAL SAMPLE 26)(AS PB) MEASUREMENT (2_)01051 1 0 0., ,,, -. --"... .. .EFFLUENT GROSS VALUE ".REQUIWEMENTF

.-. i--,. L.. BSIDY NICKEL, TOTAL SAMPLE...... (26)(AS NI) MEASUREMENT 01067 1 0 0 .. .. .-EFFLUENT GROSS VALUE REUREBT '- I- -Y-II1ii-II"INAME.liTLE PRINCIPAL EXECUI"VE OFFICERBradley J. AdamsPlant Manager"fWP OR PRIlFlEI certify under penalty ot law that this documwr and au srtaatmena w prepared under mySrecto or supenvsw in accontanre wo a system designed to assure that qualified personnel property gather and evase the irmdI aion aubnaitted Based on my inmomy of the persmon or personswho manage ae systen, or amse persos dictly responsble for gathering die bufotmatin.

tderdiomation submitted is. to the best of my knwiedge and beief, true, accurate.

and complete.

Iarnaware that there are sgnWfcan penal for auloin false information.

bxhd1n dhe possibft ofoe and eigons ent for knowwn valwioa.ICOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this oulfall 13 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winlield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERcol 0DISCHARGE NUMBERMONITORING PERIODYEAR I MONTH I DAY ' I E MONTH ý DAYOCR0501MAJOR(SUBR 01)F -FINALWWTP (FORMER 001C)EFFLUENT* NO DISCHARGE From:-018 11I1 101 1 ITO:l 1a 111 310NOTE: Read instructions efore comrietin mis formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER FTYPEP M AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISZINC, TOTAL SAMPLE 26) 19) 5W(AS ZN) MEASUREMENT (26) _(19)_50_

01092 1 00 9En' -L"EFFLUENT GROSS VALUE MGJL--.DAALL GMAB..... , ......___'__ 30.. ODAY AVG-

ALYMAX"-

MG/L_ -A__ _LY ___"SAMPLEOIL AND GREASE MAUREMENT (26) < 2.6 3.5 (19) 0 240 GR0358 1 0 0. WFK-LBSDY 7- MGL WEEKLYEFFLUENT GROSS VALUE RUREET* r -_ ________

30 DAY AG DAIMAX -FLOW. IN CONDUIT OR SAMPLE 0.034 0.056 03) 0 135 TMTHRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 i-- r" .... .. .P- ..EPORT ---..EFFLUENT GROSVLE ;EURwET 3 AAG ~ ~ ' MGD -- DLY TAJZSAMPLEMEASUREMENT SAMPLEMEASUREMENT REQUffREMENT-

-- .7 .SAMPLEMEASUREMENT____________________

-ER M E .2r -,- :. ::,..-. --:- .. 2- -_.. ., ...... ... -.-:.: _ , .--- ._ .- .., ... .SAMPLEMEASUREMENT

............

._ _ _ ~ -.i .'. ......-:MESREMENNAMFJITLE I cerely ulder penalty o law that Ins docurnert and ag attachiments were prepawd under my J Ii TELEPHONE DATEPRINCIPAL EXECiLMVE OFFICER direct-io or uperacist in acwodance with a Systei designed to assure tha %sawiied personnel

-'I-pBJperty gather a an e the olomation lniatted.

Based on my bixpoyf the peson or persons /L.' 815 406-3700Bradley J. Adams who manage the system or tliose persons dilrety responasde for gatuhoin the, irntom. theinroation subendtd is, to the best ot my Iinorwedge and bobet. tue. accurate.

and comrete.

I arn SIGNATU"-OF PRINCIPLE Plant Manager aware tt athere are sigficart penalties for subenatinflse irdaon.awn, indiV the possibzy of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTWED Ot PttgE Mne and inIprlionrnem for ow"V wioiatwn.

AUTHORIZED AGENT COD _UMBER YER _ONH_ ACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 610101L0048313 PERMIT NUMBER001O 0I DISCHARGE NUMBERMONITORING PERIODYEAR MONTHI DAY I YEAR IMONTHI DAYOCRO501MAJOR(SUSR 01)F- FINALRADWASTE TREATMENT (FORMER 001 D)EFFLUENT... NO DISCHARGE Frm:I 0 1 8 1 1 I 1 I 0 1 1 To:I 0 I 8 I 1 I 1 1 3 10__________________NOTE:

Read instruqctions foelo complefing

'this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOLIDS, TOTAL SAMPLE 26__.3<0__9 20CSUSPENDED MEASUREMENT (26) < 0.3 <05 (19) 0 240 CP00530 1 0 0 '- _ERW-' -..... -15.0., 3.....0:.0

.-.W-E-LY O '"EFFLUENT GROSS VALUE R- EL- .:.Y " -".' .0DA5.0G

-DAL -" --.. "'OIL AND GREASE SAMPLE 26) <1.4 <14 19) 0 240 GRMEASUREMENT 035621 0 0 .."I: '- -.-- -EFFLUENT GROSS VALUE REQUI .--ENT. -3b VG-. :.. .0y '.._ .0.. .MG/L WEF-Y GRA.________

________>3OIAYAV

'PW MAX. _____FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.022 0.022 (03) ------ -0 135 CN50050 1 0 0 ':EMT ~ fT *.REPORT-.-

MGD.M T- __ --. DAILY, CONTINEFFLUENT GROSS VALUE REQUI .-ENKT. 0.DAY AVG.: .-i-$LYMMAX

.GD -SAMPLE M'".. ..." " " ..MEAURE EN "0 ".......:

SAMPLEMEASUREMENT.

--.,

.-. :..-. ... ..-.- ...-REQUIREM4ENT 2 .. ---*-. -. -- -.: -SAMPLEMEASUREMENT-

- ..r .ER.:- r * .. ." .-'.-. -..,- .* .SAi~vMESAMPLEMEASUREMENT

-n w h i " ,-_ "-- -..: --: : : : : : -: : ......:; i : " ." i .: ; : : .. : : ! i : .:NAF"EffTLE I certify under penty of law that to docwfnenm ard as allaa-nenl were pared wider my TELEPHONE DATEPRINCIPAL EXECUTIVE OFFICER declion or sweision m accortance with a system desgnd to assure that quialfed peionnepepeWI gather ai evakn e the WonIatM nsubrifte Basedon my riqy at te pero= orpersona

/5406-37Bradley J. Adams who manage the system. or those personas dic mc respoa for gatheig the minaion.

the 14 7 08 12 16lormabos suLbmtW is, to the best oe my knoted~ge anrd bef, tul. Um. ctvra arn oempie I am SIGNATU%

OF PRINCIPLE

.Plant Manager aware that there are sgaicant peralties lfor subm al tsae anfoatmur.

kchding the possbty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTtiVW OR PAIN7 ED re and I for w vowors. AUTHORIZED AGENT CODI N MEEION HCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reterenice all attachments hem)1. Flow existed through this outlall 5 of 30 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 1 PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR),L0048313 E01 0PERMIT NUMBER DISCHARGE NUMBERMONITORING PERIODFrom10 1 I 1 I 1 I 0 I 1 ITo:o 0 a 1 I 1 1 3 I 0 IOCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER O01E)STORMIWATER

'NODISCHARGE NOTE: Read instructions before comoletina this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

___ _N. OF STYPLEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISPH SAMPLEPHMAUEET-

--(12) 500MEASUREMENT

-040 .0 0i. 9,-.,.EFFLUENT GROSS VALUE REQUltREMENT

--MJJMM- .r. -AIU U-.GASOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (2) (19) 50000530 1 0 0 7--ERMrr-..-.:

.'- -"-.----

-.15.0- 300 '--. SEE.EFFLUENT GROSS VALUE "-REQUIR '-S -.3LB/DY :AVG 'AILY......PERMIT "GRA_'Fir... .... :-

.300; X G .; fiW X -.: MG/L .-.-.PE rr:. ..CHROMIUM, HEXAVALENT SAMPLE ____(AS CR) MEASUREMENT (2) (19) 50001032 1 0 0 -*5D(O"02 GLDIY GA;L--':"'"""

": " ."": -'-- ' .BS/DY -*: /"EFFLUENT GROSS VALUE "EOIIR .:_._' ., 30.DAYAVGk 1' _

DAILY" " R___CHROMIUM, TOTAL SAMPLE(AS CR) MEASUREMENT (26) (19) 50001034100

-P .(: ..r-LBS/DY 100_, 1.0_MG/L-DADLY

-MGRA....130EN :77 ..... -.r .: :. _0 -Y. ; GRA -.EFFLUENT GROSS VALUE L.,F:E. Y:EMEN--3 AVG

-A..."-._..-.

COPPER, TOTAL SAMPLE (95(AS CU) MEASUREMENT (26) 19) Soo01042 10 o-ERT o 10EFFLUENT GROSS VALUE .IR_ MENT ---1. Y 30 D AI X MG/LYRIRON. TOTAL SAMPLE(AS FE) MEASUREMENT (26) (19) 50001045 1 0 0 -- .PER"- .. :1. -".DAILY. OA ' -. .:G, ..EFFLUENT GROSS VALUE -REQUIREM

,.. -. -.-.. L -.30.DAY AVG DAILY M '. MG/ _. -DAIL ,RA.LEAD. TOTAL SAMPLE(AS PB) MEASUREMENT (26) (19) 50001051 1 00 z-- M0-T' -.'-:- -... 02'-O'o " "- D GR"BEFFLUENT GROSS VALUE .REQUIR..E.T

-" .. 30 .D2AYAVG DAILYM AX" MGILNAME1'rlTLE I certify taxler penalty oatla thatt hie dmcunw and al atachmens

--we pmpared under my ..- I/, TELEPHONE DATEPRINCIPAL E(ECLUTIVE OFFICER &rW"n or upe in accordanc wrl a system dwsgned to assure that quam pedisTEHnet

-Bradley J. Adams propegathr and evaetue "m tion ed. BMW on ny kxoq of ft peron D, pemomo. 815 406-3700who manage the system, or thxee pees s " reponsim for gatern the W l ft 40612706P M gormabon subtmited is to the best of my knowledge and beele, tre, a0curale, and complete.

I am SIGNATU F PRINCIPLE 0_ 12_1_PlantManager awa mtha ther M asig penalIeso MNt g te"ad omaiondum fte EXECUTI E OFFICER OR AREA NUMBER YEAR MONTH DAYinean AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments hem) AGF..1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2- There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through this ouffall 3 of 30 days during the month.EPA Form 3320-1 (Rev 399) SD PAGE 1 OF 21 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMn-rEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, IL 6055FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERE01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001 E)STORMWATER

NO DISCHARGE MONITORING PERIODF YEAR MONTH DAY I I YEAR MONTH DAYFrom:l 0 1 8 1 1 1 0 1 1 1 TO: 1 0 1 8 1 1 1 3 1 0NOTE: Read instructions before completir this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSIS TYPENICKEL, TOTAL SAMPLE19) 500(AS NI) MEASUREMENT_(6 19 0EFFLUENT GROSS VALUE EQ:I"--EN:

-_ l. S -Y , -.30 DAY AVM ."DAILYMA"-

-GRABINC, TOTAL SAMPLE50ZN) MEASUREMENT(2)1950 01092 1 00 --PE..-. .- .-". '.EFFLUENT GROSS VALUE UIREMENT

, ....; , ..k. A : .L. DYD IL MA.-...Oi N RAESAMPLE

____ ___OILANGREASE MEASUREMENT (26) 1.7 1.8 (19) 0 290 GR03582 1- "BSDY -015,0--"

20O " ..-- -TWICE/LBS/DMG/LGRAB EFFLUENT GRS VAU-:QIEET.---~~=-

30 AYvfo.t DAILY'MAX MG/L MONTH' ___FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 F*CIT= -PERMIT -.--REPORT-,RPORT G. .-'TWICE! -TOTAEFFLUENT GROSS VALUE MOPQNTREME&U 30 DAY AVG "AI.Y MAX ..... ..........

__ -- M-N-h--SAMPLEMEASUREMENT_

--PERMIT."______ JEQUIREMENT a __SAMPLEMEASUREMENT

_____ _____ _________

PERMIT. t ~ .. -__SAMPLEMEASUREMENT

.E"iT .j:-~ .*~ "-."* -..... .--: : :; .'______________

MEASUREMENT-

--_ _____________

NAME/T;E I .cer .underp --w peal ..a thati's document and all attachments were prepared under m-y TELEPHONE DATEPRINCIPAL EXECUtiVE OFFICER erection or supervision in accordance wtlt a system designed to assure that walite persone-Bdoperyeayerandevabitethe infomatinsubmited.

Based on my inquiry of815 4he-3700 081Bradley J. Adam who manage the system, or those persons directly responsible for garnering the infnamone 8 0 12 160n0mali'in submitted is. to the best ofmy hnqWetga and bele. rue, accurate.

and complete I amn SIGNAT IE 6F PRINCIPLE Plant Manager aware via there are significant penalties for Submit false information, including the possibty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPED C and impnsionmen for M vimns. AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2.OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERF -001 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALCOOLING SYSTEM SLOWDOWNEFFLUENTNO DISCHARGE I MONITORING PERIODI YEAR MONTH I DAY I I IMONTHI DAYFrom:1 01 81 1 11 10 11I 0 8 I 11 11 310 Il I i l I i II I I ! I I aByron, IL 61010NOTE: Read instnctions efore completinm this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISPH SAMPLE 86MEASUREMENT 862 8.69 ( 12) 0 240 GR00400 1 0 0 7-<E~T. __- 0 9.0 -SU .EEY- GAEFFLUENT GROSS VALUE -REQUIREMENT

--- MNIMU '_'_"_'__

MAXIMUM-

-COPPER, TOTAL SAMPLE(AS CU) MEASUREMENT

-26) 0.010 (19) 0 240 GR01042 1 0 0 --iERT -%ý ...- B/D -~. 001 ......EFFLUENT GROSS VALUE RE_- i T- --- L -' .., LWEELY GR-ABZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT (26) 0.030 (19) 0 240 GR01092 1 0 0 ' ' M:T -'. --10 -.EFFLUENT GROSS VALUE REQU ..ENT .- LBS/DY -" ' -ý -. "AL MAX -G.LY_ ... -o .. .7.OXIDANTS.

TOTAL SAMPLE 26) SooRESIDUAL MEASUREMENT (26) (19) 50034044100 --M .,--"--- 1' 0..'.. -D--. ..EFFLUENT GROSS VALUE REQUIREMENT.____

____ AL MGILWELY--

GAFLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 18.58 2544 (03) 0 1 CN50050 1 0 0 .-- 1EMT ____EFFLUENT GROSS VALUE : ' MGD .-:.-- -- -'. .- DAILY- CONT.N"-____ __._"_____

E'UIR ME'T.'30,...

4 "f" D'LY 4 " -. ..-- .-___- -_ ,.__ _CHLORINE, TOTAL SAMPLERESIDUAL MEASUREMENT

_26) 0.11 0.33 (19) 0 240 GR50060 1 0 0 -.-PERMI.

-M..LEFFLUENT GROSS VALUE --EUiREMEN1ý

--SY-020i.

_B.:.Y-.;.

0.2 .0- y -GRAB ....... .... _. --. _- --... -. -_ 30 DAY AVG.MAXIHYDRAZINE SAMPLEMEASUREMENT

-(28) (19) 50081313 1 0 0 7"7,"- -' -"-7-LBSD

--;. -0.;031 -MG -DAILY-WHEN EFFLUENT GROSS VALUE : -"."Y .... , ."DILY-MAX7.

_GP&AMErnT LE I oert4f wider pealiaty of law itha the documient and au andineimen were preare wider my TLPOEDTPRINCIPAL EXECUTIVE OFFRCER direction or supemrsion in accordance with a system designed to that qualtd person LEPHONE -ATEproperthgter arid evabse theinfeormaiton subtrinted.

Based on my wqury at toe perPrsoneons 815 406-3700Bradley J. Adams who manage the system. or those persons dfreotly responsbe for gathering the information, the , 08 12 16intomation is. to the best of my erowledoe and bedef. true, accurate.

and complete.

I SIGNATYiE OF PRINCIPLE Plant Manager aware thai there are significat penalties for submitting false includaig the posaiblty of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTAVD OR PRrr D fne and irpdsionrirr for knowing violations.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)Per Special Condition 4C., the maxdmum allowable blowdown temperature calculation results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3/99) SO PAGE I OF1 PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)IL0048313 002 0PERMIT NUMBER IDISCHARGE NUMBER[ MONITORING PERIOD[YEAR IMONTHI DAY I I IMONTH DAYOCR0501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

...NODISCHARGE From: 0 18 11 1 1 10 11 To:lo 1 0 1 11 1 3 1o0NOTE: Read instructions etore completna this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISPH SAMPLE 12)MEASUREMENT 00400 1 00 f~RW-~~ *60. 0S ,SEEEFFLUENT GROSS VALUE REQUIM MI-MIMUM1."

-_'.-'._

-M -M PERMIT ...*..SOLIDS, TOTAL SAMPLESUSPENDED MEASUREMENT (6 (19)00530 1 0 0 .-.-PER -IT... .-.,--" .BS/DY ." 15.0-.. 300 -. SEE GRABEFFLUENT GROSS VALUE W..--"A PE T "",CHROMIUM, HEXAVALENT SAMPLE 26_9(AS CR) MEASUREMENT (6 (19)01032 1,00 L. T_ 70.1 7. 02. D 'EFFLUENT GROSS VALUE REQUIREMENT."'

-.---_ __" __" __" _ Y "_._- ..__ 30 DAY-AVG :AILY -." MG/L -DALY .RABCHROMIUM.

TOTAL SAMPLE 26) 19_(AS CR) MEASUREMENT (26) (19)01034 1 0 0 :.0MW -MGI .*EFFLUENT GROSS VALUE E '"-" -....DY.. -1 G .AY- DAyMA- :ILY. .-COPPER, TOTAL SAMPLE 26)19(AS CU) MEASUREMENT (26) (19)01042 1 0 0 -z-En~Rr.

-'-C .-.EFFLUENT GROSS VALUE --30.T.- L"S/DY -.-

MG/IL A.. .-..IRON, TOTAL SAMPLE(AS FE) MEASUREMENT (26) (19)01045 1 0 0 .-PRI ' .-1-0 1.0.to -EFFLUENT GROSS VALUE -, .. .WY- 3 DAYAVG ...AILY MX MG/ DAILY %GRAB'LEAD, TOTAL SAMPLE(AS PB) MEASUREMENT (26) (19)01051 1 0 0 -&-"RMIT.

-- -0.EFFLUENT GROSS VALUE *:REOUIR N .. ..- .30"DAY'AVG DAILY.. -- " MG"I .A-L. ., .PRINCIPAL EECS~tIVE OFFICER dieto or suevso in acotac wit a syte deige ito asuet %fldpe TELEPHONE DATEproperty gaftwe and evalute ate infrmation submitted.

e ae on my mqanry f the persno persmtBradley J. Adams wh~o manage the system. OF those persons drectly resPonsd*

.for gathenng the inomlation.

th -4 815 406-3700 08 12 16informalton submitted is. to the best of my Mawledge and belief. we. accrate, and complete.

I a SIGNAT. OF PRINCIPLE Plant Manager are that ther are sigrurniam penalties for surmut1g lase ircdg the psty EXECUIEOFFICEROR AREA NUMBER YEAR MONTH DAYWPM OR PRIAM me and impsonment for ule violations.

AUTHORIZED AGENT CODE NME YA M TH DCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachmensf here)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin dunng the month.2. This discharge point was not used this month.EPA Form 3320-1 (Rev 3/99) SD PAGE 1 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winrield RoadWarrenville, II 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBER002 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER

** NO DISCHARGE M ...I MONITORING PERIODYEARI MONTH DAY I I I IMONTH DI DAYFrom: I 0 I 8 1 1 IIJ Jj To: L_2_ L 8 1 1 1NOTE: Read instructions lore comoletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER EX OF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS TYPENICKEL TOTAL SAMPLE 19)(AS NI) MEASUREMENT (26_ __19), o o ---. .... -....... -::- : .- .01067 1 00 -PRI -.. __- 0§2.0EFFLUENT GROSS VALUE .-REQUIREMENT

-" -30 DA, AVG DAILY ., MG/L _ DALY .,.ZINC. TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19)01092 1 0 0 :l:.-:ERM1T.

.- -,:".--.--LD.-.Y

.1.0 -A -L" -...EFFLUENT GROSS VALUE REhUdMN ..- AVG PALY MAX MG/ YOIL AND GREASE SAMPLEMENT 19)MEASUREMENT

--" (2Y) 159TEFFLUENT GROSS VALUE M-DY0IAEMX ...,,FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 03)-50060 1 00 1 U- EOT -REPORT ~ G .~TWICE/ 'OAZFo s : .%-M a T .:: , -. ---"o: .- ....... .. .A;:. -..Z EFFLUENT GROSS VALUE --REQUIREIMENT 3D16AVG AY .MONI-h. `,,7SAMPLEMEASUREMENT REIEN _ -___SAMPLEMEASUREMENT

..-.. -, -: : , ........ '_ _ _ _, ._Q. .- ... , ..-SAMPLEMEASUREMENT

-REaUWREIENT.'.1s______

___NAETE I candiy under Penally of law mat thes document and at attachmnents were prepared under my TLPOEDTPRINCIPAL E.XECuTIVE OFFICER direction or supernwno in accordance with a system designed to assure that qualified peronnel TELEHON DATE anaevabite te informatinSbmitted.

Based anmyunqiry ofte person rpemor4i 0630Bradley J. Adams wo manage me system, or those pemons directly responsaible for gathng the iformnation.

the SIGNAT8 3 08 12 16information subfned is. to the best of my Imowledge and belef, true, accurate.

and complete.

tam S IAL OF PRINCIPLE__

Plant Manager aware ta there am signiln penalties for &suzmttglatis Information, Icldiung the possb* of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYT OR PUn fne and unprisonnu for knowing violations.

AUTHORIZED AGENT CODE NUMBER YEA MNTH DACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Referenc all attachments here)EPA ForM 3320-1 (Rev 3W99) SD PAGE 2 OF 21 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 November 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)11/01/0811/08/0811/15/0811/22/0811/29/0812012012012012081.768.170.267.668.2Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of November 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byr-sh~byrondb\cierk\MonthlyDMR~attachO I\NovO8 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 November 2008COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 30 of 30 days.k:byrs-h\byrondb\clerk\Mrnth~yDMR\attachO I\NovO8 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

_Minutes)

U-I U-2 U-I U-211/01/08 20 26 11/08/08 25 251i/02/08 25 27 11/09/08 27 30i1/03/08 26 2911/04/08 26 3111/05/08 25 2511/06/08 33 281 1/07/08 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 11/03/08Time: 11:04Analyzed by: J.P.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.E0.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.004iK 1- -0255075Minutes100125 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(_Minutes)

U-I U-211/10/08 25 2511/1o/08 25 2511/12/08 25 2511/13/08 25 2511/14/08 25 27.11/15/08 27 2511/16/08 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 11/10/08Time: 11:07Analyzed by: M.D.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.50 --,0.480 __ _zq 1if 1r :1 1 10.462 ---0.44---0.42--0.40--0.38-- -0.36 -0.34 -0.32-0.30-0.28-E 0.26CL0.24--C 0.220.18--0.16 ---.0.14-0.120.10--0.08 , =0.06-0.040.020.00 ------------------------------

__ -0255075Minutes100125150 EXELONBYRON STATIONPermit U-0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-211/17/08 28 281I/18/08 25 2511/19/08 27 2511/20/08 25 2511/21/08 25 2511/22/08 25 2511/23/08 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 11/17/08Time: 10:20Analyzed by: M.H.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.282 0.26C& 0.240.220.200.180.160.140.120.100.080.060.040.020.00T I T I 1tI ~II0255075Minutes1001251500 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

_ U-211/24/08 25 2511/25/08 25 25I1/26/08 25 25I1/27/08 25 2511/28/08 25 2511/29/08 25 2511/30/08 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 11/24/08Time: 13:09Analyzed by: D. B.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.Ea.0.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.001 -44 111[TA ILW --_0255075MInutes100125150 ExeiQn.Exelon Generation

Company, LLC www.exeloncorp.com NuclearByron Station4450 North German Church RoadByron. IL 61010-9794 January 20, 2009LTR: BYRON 2009-0008 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit NumberIL0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report for.Byron Station, Units I and 2. This report covers the period of December 1, 2008 throughDecember 31, 2008.Special Condition 5 of the NPDES permit requires the station to weigh the copper anodes at theend of the zebra mussel control season and to include the total mass of copper used in thedischarge monitoring report. The zebra mussel copper ion skids were shutdown on December3, 2008. The anodes of the OA copper ion skid were removed and weighed on December 18,2008. The anodes of the OB copper ion skid were removed and weighed on December 18,2008. The total mass of copper used for zebra mussel control was 192 pounds.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, BradleyPlant ManagerByron Nuclear Generating StationBJA/ZC/sdk Attachments bcc: J. Bolte -Environmental

-CanteraZ. Cox -Chemistry

-Byron NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Genehraton Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACIULY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCR0501MAJOR(SUOR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT* *NO DISCHARGE I MONITORING PERIOD.YEAR IMONTH DAY I YE MONTHI DAYFrom:l 0 I 8 I 1 I2 1 0 1 1 1To:1 0 1 8 1 1 2 1 3 I 11I I I I *

aNOTE: Read instructions before compJleti this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREOUENCY AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS SOF TYPESOUIDS, TOTAL SAMPLE (26) < 0.5 <0.5 (19) 0 285 ECSUSPENDED MEASUREMENT

_ __ODS301 0 W.0ONCE/00530 1 0 0 PE. -lT LBS/DY .---. ..: MG/L MON/HEFFLUENT GROSS VALUE -j,- Et_ ". :"- -__..B D , .." .. " 30-DAY AVG -.YMAXY MONTHMAX...

CHROMIUM, HEXAVALENT SAMPLE 26) (19) SO0(AS CR) MEASUREMENT EFFLUENT GROSS VALUE '~REOUIREMENT-

.LBSIDY AV 0.1 -./ DAIY.CHROMIUM, TOTAL SAMPLE 26) 19) SOO(AS CR) MEASUREMENT (01034 10 0 :"E j1.- -7 T ; ----.77L; : -:""" '- "" LBMY'"."-::"-"

"" ... .,: :0' ' DAILY." GRAB-,...

EFFLUENT GROSS VALUE ..... ., .=- LB-.Y

-,. ... .0-COPPER. TOTAL SAMPLE (26) (19) 500(AS CU) MEASUREMENT 01042 1 0 0 -7. LD0.. * .. .MGIL D"Y GR......ID * -M.. .-G':IL ::,/ *: o5 " :. .. " GRAB.EFFLUENT GROSS VALUE E..------

.. -..30DAYAVG.-

DALYMAX -IRON, TOTAL SAMPLE 26) 19) SOO(AS FE) MEASUREMENT 01045.1.0 0 -......._..,.LBS/DY 10 DA1"X MG/L .- )' DA0LY ""Gf :"EFFLUENT GROSS VALUE REQUIREMENT

" DAILY MAX.. --_______"":-

LEAD, TOTAL SAMPLE 26) (19)(AS PB) MEASUREMENT 01051 1 0 0 7-.77--7

°.-GR ."---. " !01510 ~ $EMF> ~~LBS/DY 0 .-.4MG/L DAILY. GASEFFLUENT GROSS VALUE -

" .'.:t30DAY-:VG.

Ay M0. "_.-NICKEL, TOTAL SAMPLE 26) (.19) 500(AS NI) MEASUREMENT(

, i ,. ..-" ."', .' -.--,. ,,, -" -"2* .01067t1a0L0

.asMTonV./Yo'the 10 'o..r. 1 _ LBID yG -DAILY-'

FAEFFLUENT GROSS VALUE 'REOUIRENT.

' '3 A AV DAIL-YMAX

.kAwnL ceitify uder pmiaily of law tha thes document and all alad~waft were prepared under my i TEEHNEDTPAINCIPAI.~

~ ~ wacio oX~~lEC'1E re~ wpe~svm in accodance witt a system designe to iassue tha qujalified pemortrid

-1 _______priqief ather en evalmt the irdoiiahei tiblled.

Based on my asymy d Uto peiami at pemson /,44 5Bradley J. Adams who manoae te system, orf tse persors dirctly respormle for gathering the into15atio.

the 20onhen submitted is, to the best of my inor edge and mru aeactle, and complete am SIGNAT OF PRINCIPLE0902 Plant Manager aware dtatthe are SWiicadI penalties tar suttN false mimtom on ctkedN the posuIbity of EXECUTIVE OFFICER OR AREA NUMBER YEAR 'MONTH DAY__ Id-D , and eRIe for knowmig viofaasm.

AUTHORIZED AGENT COCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Refereoe all attachmmnt hers)1. There was no discharge of processed steam generator chemical cleaning waste water durng this month.2. Flow existed 25 of 31 days duftng this month.EPA Form (Rev 3/99) SD PAGE 1 OF?

NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAMEJADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadIL0048313 PERMIT NUMBERA01 0DISCHARGE NUMBEROCRO501MAJOR(SUBR 01)F -FINALDEMINERALIZER REGENERATE (001A)EFFLUENT..'NO DISCHARGE E"-j ...I MONITORING PERIODI Y MONTHI DAY I I YEAR FMONTHI DAYFrom:l 0 1 a 1 1 2 1 0 1 1 ITo:l 0 1 8 1 1 1 2 1 3 1 1I I I l I l III -..I IByron. IL 61010NOTE: Read instructions fore compIetino this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISZINC. TOTAL SAMPLE(AS ZN) MEASUREMENT (26) (19) 50001092 1 0 0 -.7 0 .1EFFLUENT1 GROSS0 VALUE """-"" , -- .. ' " LS/Y 30 DAY.AV .. D MGiL DAILY:RE-G VG' 0:: IL FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.016 0.066 03) 0 135 CN000 1 0 0 '.' ... ...RERT--" " E ." MGDP" ...... "-.... ." -. DAILY CONEFFLUENT GROSS VALUE '.R U N ".3Q 0"AYVQ.:

"O.-I'IYW

,MD -. " .. ..: -*- .' ",-SAMPLEMEASUREMENT:.:_: -: ..... --.... ... .-m___....____._..

.RE.UIREMENT

-.".- ... ..."SAMPLEMEASUREMENT

.....____ __..._ _ I......E~t.

.:, -.. -.... ..:---.-.....___.-__:.___-.,__-,_"

__...____

__ __ __. _ ".__ __ _ _ .. ._ __ _SAMPLEMEASUREMENT

a- -P RM IT? r., .- -, .-. V .:-. ..,> ..-. -.-,-.. ._ ..-. .. ... ..: .-. , .. : .....SAMPLEMEASUREMENT

ýPERlwf 7%- .SAMPLEMEASUREMENT_

PE:.I.RMIT

-.

"" -'" -: ?.:, -." .. ....."'"" " ..-e. .... L ..__ _ _ _ _ _ _ _ __ _ _ _ _ _ .II~z I~d -.:' ...:- :- .....' -"" '"-.- '- " -.~ ...:" ... .... .. ", ___.__-..__.____._.

__ _______..-.

.-'. ........PRINCIPAL EXECtIRVE FIFICER rctionr supension in acottance wem a syser desgned to assre TELEPHONE DATEpMoE 9ey9eM andy vawMteOn itdonnaonann L ed Basedlan mnr fyopoypeof ft pears n -r 40-370Bradley J. Adams wPow manag OwL sYslm. Ofutose Persons diect e for 9atern9 te info1natu te 815 406-3700 01 20rdorntabon submifled is. to the best dc my kimledge and b". etue. aurate, and compiete.

I am SIGNATURE OF PRINCIPLE Plant Manager awarem OW via are s69igm tor s5m',Ig fale i",ta anIM including of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTVPED OR sMUMi iand mpeseorntent for Mownig violabti.

AUTHORIZED AGENT iCODE- NUMBER YA MNH DCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference an attachments hem)EPA Form 3320-1 (Rev 3/99) SD PAGE2OF2 NATIONAL POLLUTANVHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)0OCR0501PERMITTEE NAME/ADDRESS NAME Exalon Generation Co.. LLCADDRESS 4300 Winfild RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 610101L.004313 PERMIT NUMBER[ol 0I DISCHARGE NUMBERMONITORING PERIODYEAR MONTHI I I YEAR I"MONTHI DAYMAJOR(SUBR 01)F- FINALSTP EFFLUENT (FORMER 0013)EFFLUENT* ' NO DISCHARGE From:I 0181 112101 I To:l 0 1 8 1 1 1 2 1 3 1 I...... iNOTE: Read instructions before comolefin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION FREQUENCY SAMPLEPARAMETER No' OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS Ex ANALYSISBOD, 5-DAY SAMPLE(20 DEG. C) MEASUREMENT C.11 0.09 (26) <Z1 22 (19) 0 290 DC00310 1 0 0 ...l 2.5- -300. 6,0.:EFFLUENT GROSS VALUE UR .30'AV, '-AIL. MAX LBS/DY .':. .-30.00.0X

"_____________________

______ ______________

3woAYAVGý.~

DAtLY MAX_. MGLMNTh CMP2PH SAMPLEMEASUREMENT

-7.47 7.65 (12) 0 290 GR00400 1 0 0 TWICEu" ' / oo- ...c " SUi ..EFFLUENT GROSS VALUE ...REQU ..MEN "- .' .-- .. M"I tA MIMUM .1U_ .'. MONTH -SOLIDS. TOTAL SAMPLE <_0.04 0.0 126) <_0. 1.1 119) 0 290 DCSUSPENDED MEASUREMENT 00530 1 0 0

-..-0 28.5 .--- ,- -' .0 TW-CE'EFFLUENT GROSS VALUE .REOUA 30'DA'AVGDA.I.':".-DAILY

.... .BDY ,..:,.""

.'3 .DAY.AVG, h..I .MAX.-..MG/L

.MONTH .__...FLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.007 0.018 (03) = 0 135 CN50050 1 0 0 -.V -POW77T 7~OT -- 7; REO---. .',Y",G -*.. MG.. .-.EFFLUENT GROSS VALUE .:REOUI..EM EKTA MAX"- ... -... .."--b"" " .' "Y "__"'.Dero1o :' LflTC* * -".-.,,,...

couSAMPL ,E -0AMEASUREMENT 0BEQR IS~BiEME J..' '. -......--, ..-.... .. ..SAMPLEMEASUREMENT

..... ... " = ,- -.... ... .. ....SAMPLEMEAUREMENT Z..NAmE/TITLE I certily under penaky do law tha this docunerd and an atachnts were prepared wider myPRINCIPAL EXECU)IVE OFFICER difCd or supesion i a ortanCe utwi a systemsied to assure oh pr TELEPHONE DATEprope ygather and evalute tdetmation surbmai B on myP nquiy Of the peoson or personsBradley J. Adams who mauage the system or tose person diredcly responsae for gahering fth idoie te 09 01 20Information sLbitted Is. to the best of my knoviledge and beief, true. accurtej, and cognite.

I am SIGNATURE OF PRINCIPLE Plant Manager aware that there are elgmiicam penalties for auht lse infornflionn, idce the poesaby do EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYmwPE M O1oire arn imd rmiser for kwb*g vioaions.

AUTHORIZED AGENT cCOOD NUMBE YEA MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachmenta here)1. Flow existed through this outfall 28 of 31 days during the month.EPA Form 3320-1 (Rev 3/99) SD PAGE I OF 1 NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITIEE NAME(ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERC01 0DISCHARGE NUMBEROCR0501MAJOR(SUBR 01)F -FINALWWTP (FORMER ODIC)EFFLUENTNO DISCHARGE I MONITORING PERIOD IYEAR MONTH DAY YEAR MONTH DAYFrom:1 0 I 8 I 1 I2 1 0 I 11 To:I 01 8 1 11 2 1 3 1 11I I I l I i *I I I I I I !NOTE: Read instmrctions before comptetin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETERUI EX OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSISSOUDS. TOTAL SAMPLE 26) < 0.7 1.2 19) 0 240 DCSUSPENDED MEASUREMENT

--( -7 .2 ( 0 2 C00530 1 0 0 t'; DA"PERMIT-M:X- L Y50 MG/I. WEE-'L' COMPZ".EFFLUENTGROSSVALUE REQUIREMENT

._.--__.._

"3 DAYAVG DA.LY MAXCHROMIUM, HEXAVALENT SAMPLE 2-) 19A(AS CR) MEASUREMENT

-(19) 50001032 1 0 0 -DAILY GRAB'"EFFLUENT GROSS VALUE PEQREMI-T

-01I0Y MG" " ..AILY " RA"CHROMIUM, TOTAL SAMPLE 2)9S(AS CR) MEASUREMENT

-(19) 5_001034 1 00 0 -"

LBS/DY .'---. -." .. MG/L GRABEFFLUENT GROSS VALUE --

...... -30 DAY-AVG -: .DAI.YMAX.

__"_:COPPER, TOTAL SAMPLE 500(AS CU) MEASUREMENT

( (19)01042 1 0 0

--, .' ' .- .0. 5 "- -,.!0DA-LY.

GRABEFFLUENT GROSS VALUE 7I.," FI 7 j. "..3.-.0 DYAVG.- DAILY MAX- " -IRON, TOTAL SAMPLE 1 26) 19) 50(AS FE) MEASUREMENT 01045 1 0 0 "- LBS/D ..0-'- -- "1Y0G= MG/ " ""A"LY 'GRABEFFLUENT GROSS VALUE K-E UIREMENT-.

-.. -- -., _._.3-DA ADAILYMAX

._......

.. ,-.- .LEAD. TOTAL SAMPLE 26) 19) 500(AS PB) MEASUREMENT 2()01051 1 0 0 02 -'- 04 .DAILY. GRABEFFLUENT GROSS VALUE .REOIJ-'.-ENT.

.LBS/DY -30AyAV DAILY-IXA

, MG/L. ... -."NICKEL, TOTAL SAMPLE(26)

19) 5(4S NI) MEASUREMENT(

2) ( 95001067 100 PR .:2.0 -. 'DAILY GRABEFFLUENT GROSS VALUE _..REOU'I N., -...- -i-- --: B Y ". -_- 3: 0 DAY ' AVG DAL .2/0NAUEMf.TLE I ceidy under penraktat law that ans doamir and anl atlaimr pre pared uder my TELEPHONE DATEPRINCIPAL EXECUnTVE OFFICER direction or supenl ion in accondance with a system oes wned to a -sure t o pe rsonnel wproperly gather ald eva ti no the Woar t Based nV qltJuY Oef e PpeMOn 815 406-3700 01 20wradley J. Adam s who manage the system , or those pesm m di&Mrec spona- ite to0 gathe r t t 1 I IAoURt! PRINCIPLE blomlawo subnitted is. to the bes of my ImoWaedge and beief. true. accur.e, and comWlete, amj1Plant Manager awae that there are s9dcant penaesr to e s sn W- m tm= uding Mthe po"ItWy of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAY_ E_ OR PM_ 'tire and _ m_____m__l_

W_ ___O"_ volatms.

AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachmnts here)1. There was no discharge of processed steam generator chemical cleaning waste water during this month.2. Flow existed through this outfall 17 of 31 days during the month.ESDFo32 (R 1 SOAEioF2WWv NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERCal 0DISCHARGE NUMBERI .. MONITORING PERIOD II YEAR MONTH I DAY I I YEAR I MONTH I DAY IMAJOR(SUOR 01)F -FINALWwTP (FORMER 001C)EFFLUENT... NO DISCHARGE EZ"I I I -- iI I I IFrom: I 8 1 1 1 2 1 0 1] To: 1 0 8 I 1 1 2 I 3 1]QUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCYLE PARAMETER OF OFAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISZINC. TOTAL SAMPLE (26) 19) 500(AS ZN) MEASUREMENT (2_) _(19)_500 01092 1 0 0 --PMT;-. -- .2--LBSIDY :.3 MG/I.~k--

2 -DAILY GAEFFLUENT GROSS VALUE ý-EQUIR --ENT.- "-. " ..--3 DAY A DAILýYM -'-OIL AND GREASE MEASUREMENT (26) c 1..4 <14 19) 0 240 GR03582 1 0 0 ::-. -!ERMIF , .--- '**.* -..,y.':. '--.50-MG. .-.EILY GR -THRU TREATMENT PLANT MEASUREMENT 50050 1 0 0 .,...-.-G"

-R._PIYMAXM

".- "- " -.AL.. TOTALIZ-EFFLUENT GROSS VALUE E ____I __.AV/G'

--___ __D___. __ ._ __,-"_."..

SAMPLEMEASUREMENT

.ROIIMN -7 7SAMPLEMEASUREMENT_____________________________

.. ...P R r- c .-... -. .-RE-..REMENT,.

_________

."- *" -",SAMPLEMEASUREMENT

-r- .e -"-r".r, ~ --.--; ; ; ... .; .i. " :.. .'.. .-, .-- ." .I'___ _"*_ _._"_"..REQU

--ENT.SAMPLEMEASUREMENT_: ' ..:. ...:'.::::-.'

-. ::' -" " :. ._ ... -.* .,'. .-, ...E U A M NT :.... " -" "- *-. , '-4.:": ......- " ." ---" , --" .. -.. ." '. .__ _ __ _ _ __ 'R;I ___ __. "',-- ., ,- "",.:.- -...-.-- .,. ..NAME/TITE I cerWy under pieafty of law tOWt 0t4 dolB*I ani a1 agaderts were pirepared undSer (ly N J TELEPHONE DATEPRICIPAL EXECL'nvE reo or super"ain c cordance with a system desge io asre thai Mualified pesoreelprraeJly gAm g and evalute e thnforman RaseW an my Vbqdf o the person or pem 815 406-3700Bradley J. Adars who manage e syseM or those perom ndrety mspsmle tot gaowe" me kronnaum te 09 01 20iormaon SbinlTued is. to me besat elimy knowledge and br", tre. acavate, and caome. Iamn SIGNTUROF PRINCIPLE Plant Manager aware e mtere are penalies for suWbrti lalse Woornabom inluing the possIty al EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYMORMNal fe and i fo k vioiabns.

AUTHORIZED AGENT CODE YEAR MONTDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAMEJADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERDOI 0I DISCHARGE NUMBEI MONITORING PERIOD II YEAR I MONTH I DAY I I YEAR I MONTH I DAY IOCRO501MAJOR(SUBR 01)F -FINALRADWASTE TREATMENT (FORMER 001D)EFFLUENT... NO DISCHARGE EJ *I -. --- -II " -I -.- I .I.From:1 0 I 8 I 1 I 2 I 0I 1 ITo:l 0 1 8 1 1 12 13 111NOTE: Read instructions before comoletino this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER AEGEUISOF PPRMTRAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX OFTYPEANALYSISSOLIDS. TOTAL -A-E(26)

-0.5 0.7 (19) 0 240 CPSUSPENDED MEASUREMENT 00530 1 0 0 "RERMIT-

-.5--"-.".

--30.0EFFLUENT GROSS VALUE R0UIAREMENT..

.AX MG/I. WEE.LY ,. .. ..OILMAND GREASE SAML 11.6 2.2 (19) 0 240 GR03S82 1 0 0 .... 4-,oELUENT -".. ." ." 30 DAY AVLGS20Y0 MGIL -WEEKLY -GRABEFFLUENTGROSS VALUE, Q-_IEUIREM

.; ._ -1 FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.022 0.024 03) 0 135 CN50050 1 0 0 .-rp ._ T -.R .F.... -D Dr;": ,," LY " -CONTnN"EFFLUENT GROSSVAUE

-EMEý..

-

MGD "._"'__-_-..

_-'.." _ _._._..._._'._'

SAMPLEMEASUREMENT SAMPLESAMPLEMEASUREMENT

....;.E. ... ..-. .-'. .SAMPLEMEASUREMENT NAMEfM1E I Cadldy under penafty dt Law thanthis document and all ttaclimena were prepared under mry TLPOEDTPRINCIPAL EXECUTIVE OFFICER diection or asm in acordance wth a sytem designed to assure dima quamied pewswnetpropely ter and evalute the fomana ub .Based an Mycn'uofthpersonorperson 815 406-3700Bradley J. Adams who manage the system. or thee perso directly respnsihe for o9aief tde Information.

the 09 01 20inoamadw submn~ed Is, to fte begt of mR kowledge and bebe, true, accurate, and complete.

Im SIGNTRV PRINCIPLE Plant Manager aware th tere are snqrcma peenallies for sublfmg fabe irdorium the poss5ay of EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYOR DCaPnff me and bimpilalonerd for leowd vigNiaons.

AUTHORIZED AGENT ICODNCOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reftenmme all attachments here)1. Flow existed through this ouffali 8 of 31 days during the month.EPA Form 3320-1 (Rev 3/W9) SD PAGE I OF1SaUJ NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES;DISCHARGE MONITORING REPORT (DMR)PERMITrEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenville, IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IL0048313 PERMIT NUMBERE01 0I _DISCHARGE NUMBERMONITORING PERIODS I MONTH I YEAR MONTHI DAYOCRO501MAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001 E)STORMWATER

... NO DISCHARGE From: 0 1 I I To2 0 1 1 1To:1 8 1 2 1 3 1 1NOTE: Read instructions before comoletin this formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO FREQUENCY SAMPLEPARAMETER AVEAG MXUM NISEOFRQUENC AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS FANALYSIS PH SAMPLE ,12) 500MEASUREMENT 00400 1 0 0 :,--.---:e-;

.--.:-. -. .'6.-.. -09 SEE- GRABEFFLUENT GROSS VALUE

_" -" A-

--MAXIUM.*

SU " GRASO UDS, TOTAL SAMPLE _:"'. "PERMIT.500 SUSPENDED MEASUREMENT

26) (191 50000530 1 00 !16. SEE~i_,,_ LBW/Y 4 Lj. 150 , -3a SE .EFFLUENT GROSS VALUE -U'-"_ .--, 3'D.YAVG,."-

DAY.MA. --PERMIT' -CHROMIUM, HEXAVALENT SAMPLE(AS CR) MEASUREMENT

26) (19) 50001032 1 0 0 0~r~PR~T

1.CHOIUTTA

' PR _____ LB&IDY -.-- -.01AAG. 0.IL MA M(-DAILY' GAEFFLUENT GROSS VALUE -EQJ"IENT:

_ :','. .-30,DAYAVG:

DALYMAX -.CHROMIUM.

TOTAL SAMPLE ....2 .....)(AS CR) MEASUREMENT (19) 50001034 1 0 0 PERM-IT-

-10 * * ." MG/I. .DAILY -" GRABEFFLUENT GROSS VALUE I.E -" " .:"" " 3Q.DAY AVO"-DALY MAX `U".' -COPPER. TOTAL SAMPLE 2 500(AS CU) MEASUREMENT

-(2) (19) 500010421 0 o0 ...ER..... -....EFFLUENT GROSS VALUE E M " "" -DY -" 0 'DA .V'.DAILY MAX -.' -DAILY"IRON, TOTAL SAMPLE 500(AS FE) MEASUREMENT (20) (19)01045 1 0 0 .ERMIT-'

-- '" -" ' ... " .1.0,-EFFLUENT GROSS VALUE 3REQIREME:.I'::'BS DY -, 00AYYMG/L

' " " DAILY -.: G.RA.... ..____-._-__,

'_. ...... ._-.: : ___ _0_o__._v_

-:_ DAL ~ -.MAX -.:. -_.. ... ..... -...LEAD. TOTAL SAMPLE(AS PB) MEASUREMENT

-(26) (19) 50001051 1 00 7.77 ERMIT --0-.'---

-. -" .-"" -EFFLUENT GROSS VALUE 'T 7- a ..",.2 ... .L .GRASNAMEnTrnE 1e08;* wider PennefY of law to ha is docmient and ani attadunente were piepared under my TEEHNEDTPRINCIPAL EXECU'lVE OFFICER dirdcbon or supervism in accodaince wth a System designed to assure 0 laed peTELEPHONEDATE Proetdy gatiner arid evakite tie Informationstul e ed. Based an my kinqur of fth persaon 6~~IO1 15 406-3700 0Bradley J. Adams wno manage te system. or ftse pes=a directly respoea for gatheW the ormation.

the 09 01 20WomenWS Sttmed is, to me beat of my knowledge and belief, t.e, accurate, and complete.

I SIGNATUI OF PRINCIPLE Plant Manager aware thriaIe am m anabes w nswimminlg atselimrdoin.stImahdng the pomsby d EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYroW OR PPseT -18 and kpsdenn fm M W AUTHORIZED AGENT CODE NUMBER YEAR MONTDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference aD attachments hem)1. No Turbine building wastewater was discharged to the Stormwater Runoff Basin during the month.2. There was no discharge of processed steam generator chemical cleaning wastewater during the month.3. Flow existed through this outlaD 2 of 31 days durina the month.EPA Form 3320-1 (Rev 3/99) SD PAGE I OF2 NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMITTEE NAMEIADDRESS NAME Exelon Generation Co., U.CADDRESS 4300 Winfield RoadWarnnville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010IIL0048313

-1 1E01 0II lI PERMIT NUMBERI I DISCHARGE NUMBERI MONITORING PERIODI YEAR I MONTH I DAY I I YEAR I MONTH I DAYMAJOR(SUBR 01)F -FINALSTORMWATER (FORMER 001E)STORMIWATER

.*NODIlSCHARGE I l l I1 l I lFrom: 1 0 1 81 11 2 1 0 11To:! 0 F 1 1 1 1 1 1hT 1i i I I.L" "=NOTE: Read instructions fore complein mis formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER

__F__TYPEO AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ANALYSISNICKEL TOTAL SAMPLE 2_) 19_0(AS NI) MEASUREMENT-010671 0 0 .--PBRMIT-:.:-..;

' ' -. -,' LBSIDY 10 .2.0-.M..

L -,' DAILY , GRABEFFLUENT GROSS VALUE REQUIREMENT 3 '-D% L .. " -A0A :" AV DAILY'..

MAZINC, TOTAL SAMPLE(AS ZN) MEASUREMENT

_____)(9__

01092 1 0 0 TO- 2.0.'-'-

... -.' --.--.. _ .O'.-...

.. * .EFFLUENT GROSS VALUE ;RkdUW E "- -0'. -A.. .', .. I .30 DAAV(.. DAILY .MAX." MG/L DAILY:OILANDGREASE MEASUREMENT (26) < 1.4 < 1.4 (19) 0 290 GR03582 1 0 0 10.P~fj MG/L TWCE G -LWEFFLUENT GROSS VALUE EUI .F"- ,7. -." :.-: -" -"1 " .ILy X20 .-.TWICE/ GR.FLOW, IN CONDUIT OR SAMP LEThRU TREATMENT PLANT MEASUREMENT 0.681 1.304 (03) .--. 0 290 TM50050 1 0 0 -.ERMf.- -,.K OfI. -.....wc--,-EFFLUENT GROSS VALUE '"*A-" ".-MD AVZ .-YSAMPLEMEASUREMENT

.4..-, ..I. --.,M .' .; -vSAMPLEMEASUREMENT

, PER M .".. -7 '7,--. :.- " -- .-SAMPLEMEASUREMENT

z. -.. ...-:, : .-..:; : ..-.-. .... -. ...: ..-. ...... .. -.i ... .: ".- .--o :NAMErnTTLE I candy under peataly at law that tedocmmet and alt afawttachet were prepared under myPRIPOPAL EXECUTIVE OFFICER Mcbm or ,up,,m in wt a system deigned to assurdoqae

, TELEPHONE DATEpmPedy gather and evahe the elndormaton s imtted. Based an my dthe : o V,,l r 815 406e-3700 9 MBradley J. Adams who manage the system, Or ftose persons di,-ectly responsbe for ga#WneV the Information, ft09 012M suadme is. E o the best of my Wmowsue and iebe. tue. accuran anpiee. lam SIGNATGNA bE OF PRINCIPLE Plant Manager aware thd there am signicantl pnaies lto snLng tatse lormationltinuding thet posesdyo EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAY___ ORPR4ED Ie and tIrprisiotnmertl for linoatng violations.

NUBE YEAR MONTDAM-- -M I AUTHORIZED AGENT CODECOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all atlahnments here)EPA Form 3320-1 (Rev 3/99) SD PAGE 2 OF 2S p NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)PERMITTEE NAME/ADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWan-enville.

IL 60555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron. IL 61010IL0048313 PERMIT NUMBER001 0DISCHARGE NUMBEROCRO501MAJOR(SUIR 01)F- FINALCOOLING SYSTEM BLOWOOWNEFFLUENT* NO DISCHARGE E3MONITORING PERIOD IYEAR IMO DAY YEAR I MONTH DAYFrom:1 0 1 e I 1 I2 1 0 1 1 TO: 1 18L1 12 13 1i 1....I I INOTE: Read instructons before completin his formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY SAMPLEPARAMETER--

-OF S M LAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS ANALYSIS TYPEPH SAME 8.56 8.99 ( 12) 0 240 GREFFLUENT GROSS VALUE R"QUIEME'T 6.0:: .",' -' "U -"EE LY0GRA "COppER, TOTAL -SAMPLE__

(AS CU) MEASUREMENT

--2=)-- 0.007 (19) 0 240 GR01042100 1% 0 0 .r"t --'k :-BSY -- -:. .'-6.0 GRAB,.EFFLUENT

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ S GRS AU R Qý ' ,- .- _____ DIYMX ML .WEEKLY-ZINC, TOTAL SAMPLE -2(AS ZN) MEASUREMENT 0.029 (19) 0 240 OR01042 .1 0. .-:.-, -- --- -- .t..EFFLUENTGROSS VALUE 'BSN:- .(DY .." ".'- --. DY -. WEEKLY GRABOXIDANTS, TOTAL SAMPLE -0ESINUAL MEASUREMENT (19) 50030449 1 0 0 t--pERMrr.-2:>.

-.EFFLUENT GROSS VALUE A-i "..DY"FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 20.11 2694 (03) 50 0 13 CN50050 1 0 0 7.-P. .: .0-" .0r "-REPORT WjE- r .-. DIY- CNEFFLUENT GROSS VALUE :REQU-IR "ENT. 3O'DAA "- " MOD -, ..,- *..... :. .--.-.I....M:.GD. :' --: .... , .. :..-: ° "" .DAILY -o NnCHLORINE.

TOTAL SAMPLERESIDUAL MEASUREMENT (26) 0.18 0.39 (19) 0 240 GR50060 1 0 0 .;;.E : x ,," .-*, ...D. .V-. 0 ' -... -" ' .-w.EFFLUENT GROSS VALUE :ROIEEN.-3DY V ALYMAX GL.;EECY GAHYDRAZINE SAMPLE26MEASUREMENT

-(20) (19) 50081313 1 0 0 _RT~ 0.31 DAL WHENEFFLUENT GROSS VALUE :"'E(.IROAEW

' .-: -'- " "S:DY -; .. 1 " M " A_ ..Y W. N .GRAB *_______ D~ H A R G GPRNIA EX~V OFFICER I Certiy under I)ena ft la~w that this dommient and ant attadvfmie wern prepared undo, my_____________dmicheM Or sZ~Gpevsim~

in accodance wfth a system desapaed 19 &satie ow quaitia peasonrna TELEPHONE DATEpfopeft sattr and evatute fth vdtm submtted.

Based an my hnqy/d "h person or persom,Bradley J. Adams who awage the system, OrtP-&nsblfogaft UmeWwnagor 815 406-3700 09 01 20mfM M sunTAh b. to the my mawfedpe and befief. hue accurade, and Conmpete.

SIGNA OF PRINCIPLEain Plant Manager alae tha0 tre are sfgrcam penalies tma mialm .kindudf gthe posality d EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYripma ,ne and Irrqsomeot for owmn vwwhxrs AUTHORIZED AGENT CODE NUMBER YEAR MONTDACOMMENTS AND EXPLANATION OF ANY VIOLATIONS (Refeenc, all atachmenl here)Pe Special Condition 4C., the malimum allowable blowdown temperature calculation.results are provided on the attachment SEE ATTACHEDEPA Form 3320-1 (Rev 3/99) SD PAGE1OF1 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MONITORING REPORT (DMR)OCRO501PERMflrEE NAMEIADDRESS NAME Exelon Generation Co., LLCADDRESS 4300 Winfield RoadWarrenvilie, IL 60555I L0048313PERMIT NUMBERL 0020I DISCHARGE NUMBERMONITORING PERIODYEAR MONTH DAY YEAR MONTH DAYFrom: 0 1 8 I I 1 I To:l 0 I 8 I 1 1 2 I 3 I 1MAJOR(SUER 01)F -FINALSTORMIWATER RUNOFF BASIN OVERFLOWI STORMIWATER

- - NO DISCHARGE FACILITYLOCATIONByron Nuclear Power Station4450 North German Church RoadByron, IL 61010NOU I E: mlea insruconis before cormiena ti formQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREQUENCY AVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS AOF APSE___ ___ __ ___ __ __ ___ __ __ ___ __ __ ___ __ __ ___ __ANALYSIS T PPH SAMPLE -MEASUREMENT

........

(12)00400 1 0 0 -7"77-. , ' .,7-: .:. -6. .MA0M" SEEEFFLUENT GROSS VALUE REQUIREMENT

-7777.

..U.-GRABSOUDS, TOTAL SAMPLESUSPENDED MEASUREMENT (26) (19)00530 1 0 0 .'....:mW.Uur

.: --;',:.- .-..-.: -: .....00530 1 S0L0 -, ERM"T .. -.-=.:: LBS/DY 1:-- -: .. 15.0: '.. -30.0 --/ SEEEFFLUENT GROSS VALUE. ....40DAY'i..

-DAILYMX -GRAB,CHROMIUM.

HEXAVALENT SAMPLE 2')(AS CR) MEASUREMENT (26) (19)01032 1 0 0 ": ' -&;": "...,EFFLUENT GROSS VALUE -REOII :dN .,. -. : --_ -_-30. V .DA Y V, DAILY GRABCHROMUUML TOTAL SAMPLE(AS CR) MEASUREMENT

-(26) -(19)01034 1 0 0 F-pERIA.---

A: ": -EFFLUENT GROSS VALUE [REQUIR]EMENT MG& GRAB'-TOTAL ._.; ...:-~ ..- LBS/DY *-+/----- 1..SAMP.E DAY AVG" :..DAILYMAX-MG/ -. DAILYCOPPE'R..,

TOTAL SAMPLE

' "(AS CU) MEASUREMENT

-(26) (19)01042 1 0 0 -'.- ." .-F' -L. S/D Y .* .. .. -. .M DAILY .Y IEFFLUENT GROSS VALUE RE M- .,30EDAYTVG DALYA MG/LGRAIRON, TOTAL SAMPLE(AS FE) MEASUREMENT

-(26) -- (19)01045 1 0 0 1,0-_p R.-..---

--.-.*:.'-.;:

.. .....10EFFLUENT GROSS VALUE

.30DAY AVG -DILYMAX, MG/L '-. DAILY GRABLEADJOTAL SAMPLE(AS PB) MEASUREMENT

-(26) (19)01061 1 0 0 -- .p"pjy .-0 4'" .._ IEFFLUENT GROSS VALUE 3 0E-UIREMEN.

-, ., .... ...... .Y_ .MG/L .,NPAEITrTvE ICE ON under penafly of law that ts document and an attachments were pepamrd under my TEPO DATEPRINCIPAL EXECUTIVE OFFICER diOctn or supwvan, in acordance w4h a systern designed to assure that qua-lad personnei TELEPHONE DATE53101)t gather and evsaUe the itonrmatbi sutamtad.

Based on ry itquiry of the peison or persots 8Bradley J. Adams o -Wmaa te sysem. or thse persons directly reasponsbe for gatheng te fInImion.

t 815 406-3700 09 01 20rdomralm subntmited 1 to the best od my Wwedg and treitt, true. accurae.

andrt I SIGNATURopOF PRINCIPLE Plant Manager aware that here are sigien penaes for sulmin=g tate inlo MatO. fk the posuatky ot EXECUTIVE OFFICER OR R NUMBER YEAR MONTH DAYlwse OR~ Pie adimmsnlarfoiI AUTHORIZED AGENT CODEO ,COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments her)1. No Turbine building wastewater was discharged to the Stovmwatei Runoff Basin during the month.2. This discharge point was not used this month.EPrm 3320-1 (Rev 3/99) SD GEIOF2www 0NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHARGE MOHtITORIHG REPORT (DIAR)PERMrrrEE NAMEJADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 Winfield RoadWarrenville, 1160555FACILITY Byron Nuclear Power StationLOCATION 4450 North German Church RoadByron, IL 61010P NL0048313 I PERMIT NUMBER002 0DISCHARGE NUMBERMONITORING PERIODI YEAR I MONTH I DAY I r YFAR t MONTH I DAY IOCR0501MAJOR(SUBR 01)F -FINALSTORMWATER RUNOFF BASIN OVERFLOWSTORMWATER "NO DISCHARGE I -I -- I .I .IFrom:1 0 1 8 I 1 I 2 1 0 I 1 I To:1 0 I 8 I 1 I 2 I 3 1 1 INOTE: Read instrctions before cornoleti this formQUANTIFY OR LOADING QUANTITY OR CONCENTRATION NO. SAMPLEPARAMETER OF TYPEAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS Ex ANALYSISNICKEL, TOTAL SAMPLE (19)!(AS NI) MEASUREMENT(2) 1)01067 1 0 0 2,0-~.. DAL *RS-BS/DY MG/L " DAILY REFFLUENT GROSS VALUE Z%-. , ? ..... .. -30.. AYAG :QAILYMAX

"_,_*NC,TOTAL SAMPLE(19)

(AS ZN) MEASUREMENT(2)19 01092 1 0 0 D-AI.-.LY 7 "" -AS. " -10"EFFLUENT GROSS VALUE W04L4'D .30DAY AVG -A AX,, ,_________________

_____________

___________

.4 ,- *

r.OILAND GREASE ASME (26) -( 19)

.... 3"- -. ..J. .M- 0I .GRW -EFFLUENT GROSS VALUE _-- ._______

... _6_" _- _' _ 4.,__. ._. ."_ _ __'_'_" ... ..... "Y "-. ". -FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT (03) ....60050 1 0 0 -. RErMI..!

TT.- OR -REPORT. MD " --:- '"" EFFLUENT GROSS VALUE ..iQUIR.3GDAYVAVG

'DLY:JA -: _- _"_ " -., _ "__ -_'. .." ..,. .O-.: .-ER M ,?.. ;." .". ".". '.' ,, ".i " :.SAMPLEMEASUREMENT

-., ... .. ....- .-SAMPLEMEASUREMENT

.F4Q II3 E T .:-- .:- .. _:#dAMEITmLE Icattiy LgKi penalty d law 11W this doctmwst and all aftachmilnW WeM prepared under My TELEPHONE DTPRINCIPAL EXECUTIVE OFFICER afireammio superxi in macmodance with a slystem deained to asusm tha queffisid peteannei-l_____

BradleyJ.

Adam gather and evaltet the Idaimarr n autvvlad oae n mybiqully difth p -ea or p -815 406-3700 01 2BraleyJ.

daris who Mimags the sysam. or thaea par-rie direcoy resparr"bi for gaihand the, bIrlrtemajn the0 2Plant Manager aware that there are aoicbaM penaflties for autmiuig a" tIfalse ometimt r1ckUxw the pmssLofofY EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTYPE OR PPAINIW teadm~swdfo xmVvh AUTHORIZED AGENT LIE_______

COMMENTS AND EXPLARA1ION OF ANY VIOLATIONS (Reference all 111achashmta hereEPA Form 3320-1 (Rev 3199) SO PAGE 2OF 2 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 December 2008BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)12/06/0812/13/0812/20/0812/27/0812012012012077.474.069.080.6Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of December 2008.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak-.byr-ch\byrondb\cled\MonthlyDMRWanahOl\DcvOS ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit [L0048313 December 2008COMMENTS:

I. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.k:byr-chXbyrondb\clerk\MonthlyDMRWMhOI\DcM dJEXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-I U-212/01/08 20 2012/02/08 20 2012/03/08 20 2012104108 20 2012/05/08 20 2012/06/08 20 2012/07/08 21 23HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 12/02/08Time: 10:49Analyzed by: T.B.M.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26CL 0.24C" 0.220.200.180.160.140.120.100.080.060.040.020.00-4 1 ----------7+/---- +7__--0255075Minutes100125 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

U-1 U-12108108 20 2012/09/08 20 2012/10/08 19 1912/11/08 23 2012/12/08 20 2112/13/08 20 2012/14/08 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 12/08/08Time: 12:09Analyzed by: D.C.A.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.28E 0.26ft 0.240.220.200.180.160.140.120.100.080.060.040.02# .0 0] I {... ----- -I'[] i--. +/-j- I 1-~ I! I .i .0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time(Minutes)

_____ U- I U-212/15/08 20 2012116/08 20 2012/17/08 25 2012/18/08 30 2512/19/08 20 2012/20/08 20 2012/21/08 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 12/15/08Time: 10:40Analyzed by: D.W.B.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.E0.0.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00_ I___ ____I____ __ I--------------------------------------------

-.--J ~------------------------I --F I -F -I 1 F I -I -I -I -F -F F -F -F -I -I -I -I -I -I -I- I -0255075Minutes1001253W150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION Date Dosing Time Date Dosing Time(Minutes)

(Minutes)

__" _ U-I U-2 U-I U-212/22/08 20 20 12/29/08 23 2412/23/08 20 20 12/30/08 23 2112/24/08 23 20 12/31/08 20 2012/25/08 20 2012/26/08 20 2012/27/08 20 2112/28/08 22 21HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 12/22/08Time: 11:08Analyzed by: J.W.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.EC.C.0.500.46-0.44 -0.42-0.40 0.38 -0.36 I I0.34----

---0.324 ---0.30 I I0.228-i--

0.26 -0.21 -- i0.1422 ---~0.10-0.12 -t-+/-10.08000.02o0.000255075Minutes100125150 Byron Environmental Audit -Request for Additional Information ResponseQuestion

HH-1 Category:

Human HealthStatement of Question:

Provide NPDES monthly discharge monitoring reports for the past five years.Response:

The NPDES monthly discharge monitoring reports for all months of years 2008 through 2012and January through July 2013 are provided.

List Attachments Provided:

1. NPDES monthly discharge monitoring reports for January 1, 2013 through July 31, 2013.2. NPDES monthly discharge monitoring reports for January 1, 2012 through December31,20123. NPDES monthly discharge monitoring reports for January 1, 2011 through December31,20114. NPDES monthly discharge monitoring reports for January 1, 2010 through December31,20105. NPDES monthly discharge monitoring reports for January 1, 2009 through December31,20096. NPDES monthly discharge monitoring reports for January 1, 2008 through December31, 2008 Exel n.xon Copany. C ww,,exeloncwp.com V NuclearByron Station4450 North German Church RoadByron. IL 61010-9794 February 19, 2009LTR: BYRON 2009-0022 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

.

Byron Station Monthly Discharge Monitoring ReportPIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit NumberIL0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units 1 and 2. This report covers the period of January 1, 2009 through January31, 2009,If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley J. AdamsPlant ManagerByron Nuclear Generating StationBJA/ZC/sdk Attachments

'JIaINATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)WOOAMOE MOWrORINO REPORT (oMR)PERMrITEE NAME/ADDRESS NAME EP-'on Generation Co.. LLWADDRESS 4300 Win'm RoadWanuvUle, IL 6065FACILITY Byron Miclear Power StationLOCATION 4450 NorM German Chureh RoadByron, IL 610101.I0046315 PERMIdT NMERAm0 0DSHRENUMBER MAJOR(sUna 01)F -FwAL1OEINWALIZR REGENERATE (001A)... NO DW~HARGEMONITORING PERIODYEAR I MONTH I DAY YEAR I MONTH DAY IFrom: 0 1 9 I 0 1 1 0 I 1 1 To:1 0 I 9 I 0 1 1 1 3 1 1 1tm: law .bfor a"formQUANTITY OR LOAOINM QUANTITY OR COtNCENTRTON NO. FREQUENCY SAMPLEPARAMETER

_____OF TYPEAVERAGE MAXIMUM UNITS WMJM AVERAGE MAXIMUM UNITS ANALYSISSOL.IDS, TOTAL SAMPLESUSPENDEDLAMPLE-(26) 1.2 1.2 (19) 0 285 ECSUSPENDED MEASUJREMENT 0030 1 0 0 1 r LS.0 301um te.0,EFFLUENT GROSS VALUE FMOu , --,OW, ,,-,AV O..V MAX N..OW"HCHROMIUM HEXAVALENT SAMPE )(AS CR) MEASUREMENT

__) _ _ __)___ _01032 1 00 0p... ...062EFFLUENT GROSS VALUE AM .--B- 2 30 DAY AVG I.Y MG. DALYCHROMAUM, TOTAL SAMPLE(AS CR) MEASUREIENT 01034 1 0 0 FE .1 20OLYEFFLUENT GROSS VALUE W --LBSMOY -1L* 20_ _DAY AVG DAILYMAXCOPPER, TOTAL SAMPLE -) 19) 500(AS CU) MEASUREMENT.

01042 1 0 0 " ,PE0RMIT L y O. lie.EFFLUENT GROSS VALUE RMV 3D -A- -.-IRON, TOTAL SAMPLE(AS FE) MEASUREMENT

-(2) (19) 5000104 1 0 0a inPD- 1.0 IWDEFFLUENT GROSS VALUE : .--..BOY --R YA .MM iY *RALEAD.TOTAL SAMPLE (U) -19) 500(AS PS) MEASUREMENT

___)_ (_____010m1 1 0 0 -O- LaSmY -2 OA DALY AEFFLUENT GROSS VALUE _ECGIR _____ _0 DOW Av___a ..... AM yMAIy _, I_ I_NICIE TOTAL SAMPLE(AS (O MEASUREMENT 01067 1 0 0WSPDY IA 2,0EFFLUENT GROSS VALUE 0GIMM LBS/DY -300AYAUM

.W MA. DA.LYNALWWmM I-34.s'hn TELEPHONE DATEPFUNCIPAL F.,UTW OFRFG a or uwm in wft a slow fet Wo miftipwIr,

.... m~pedV a anM e~vnt oneml da &trit .Ba md ann. iiV ftd fht ; morp oms m 815 4 M6 3700Bradley J. Adams ,%fo Mar INs me pam. r oepens" 11c resaris br goi 1e 9tom of m e 09 02 19Fimakn &Aftd is toV geM bw oft mMW s U, gl IBME.uaus SIGNATURE OF PRINCIPLE Pam nag.e Rumr Mt rmo wehJ3WvnRb prwS fo &An" Ube I t am~i kcq tpheo1 EXECUTIVE OFFICER OR NUER YEAR MONTH DAY",E CWIW f, or, rV, oms. AUTHORIZED AGENT COD NUMBERYEAR COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Ruletiwuw d ttdna here)1. Them we no discharge o processed seam generator ctak cmening wesae wate dunn Oft 2. Flowe died 31 of31 days din this morli.EPA Form 3320-1 (Rev 3/99) PAGE 1 0F.2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)0McwRQEM0NTmroMREFMao(WR)

OCROG1PERMITrEE NAMFJADORESS NAME Exlo Gwieration Co., LUCADDRESS 4300 Winfidk RoadWarrenvile.

1L 065FACIUTY Byron Nuclear Power SatonLOCATION 4450 NoM Gemnan Church RoadByron, L 6101011.00431wEIN -AI-ACl 0DISCH4ARGE NLA48ERMAJOR(mUDR0l)F -PFiAL061110ERALI.M REGENERATE (001IA)WIFWENT"... NODS011AME f ...-' ........' ...EI .MOrOMPERIOD TnAv TI Il YEA CLOW DAY1l = = " l i INATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DISCHAMRE MoWTOAO REPORT (DMR)PERMITTEE NAME/ADORESS NAME Exelon Generation Co.. U.CADDRESS 4300 Wirfieid RoadWarrerwile, IL 60656FACILITY Byron Nudear Power StationLOCATION 4450 NoM Gennan Cu h RoadByron, IL 61010PERMIT HLMBEREB010DISHRGE NUMBERMAJOR(susR 01)F -FINALSIP EFFUJT (FORER 0015)EPPLUITENO a No Hm~mI MONITORNG PEROD IIYEAR I moNmTH- DAYI YEAR I wmON I DAYIFrom:I1 0 1 9 fO 0i CII I Ta:I0 19 101 13 1 1m BCOOUUUM AND EXPLANATION OF ANY VIOLATIONS (Refmrence al atlamets here)1. Row aiosted Uvough thU uta" 290of31 days *ftn the nmont.

0INATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPOES)-MONIO U WWl, OmRP(M)PERMITTEE NAME/ADDRESS NAME Etan Generation Co.. LLCADDRESS 4300 W'fil.d RoadWasmsvile.

IL 606FACILITY Byron Nuldear Power StationLOCATION 4450 NOiM Gennan Churc RoadIL0048313 PERMIIC o IOISCHARGE NtJMERoCR0soi(BSHJU 01)F. PEALWWTI IPVE 001C)EFFLUENTI-" MONITORING PERIOD II YEAR IMON I DAY I I YEAR IMONTHrI AY II

I .I -.-- II " I ---.- -I -- -IFrom 1L0 9 i 0 1Jf0 111 To: 10 19 1 0 1 1 13 1 1 1..I NO DsISCARGE IDJ...m IByron. IL 61010NOTE: Read bus n¢oore ttwofftmQUANTITY OR LOADING QUANTITY OR CTION NO. FREUENCYIUNIT E OF TYPEAVERAGE MAXIMUM UITS MNIMUM AVERAGE MAXIMUM UNITS NYSiSSOLIDS, TOTAL SAMPLE -(2) 0.9 1.6 (9) 0 240 DCSUSPENDED MEASUREMENT

--__ (_)__ o.0 _ ._1) 02__00630 1 0 0 3UEFFLUENT GROSS VALUE mouN .. -30YDAYAS DM.YMAI MIL- ,QHROUMUM (19) Soo(AS CR) MEASUREMENT 01032 1 0 0 T " SOY 0.1 0* *A"EFFLUENT GROSS VALUE T E-O -3lAS'f 3. DAYAO A DAILYt MM. AXCHROMIUM TOTAL SAMPLE 20 i(AS R) MEASUREMENT()

-(9)01034 1 0 0 LSPiY 1DALY dIpEFFLUENT GROSS VALUE REWEI --LBSDDALYSMAX COPPER, TOTAL SAMPLE -(2) 19) 5I0(AS CU) MEASUREMENT (2_) --_(1__ 500--"051. R01042 1 00 POW -BD -.0EFFLUENT GROSS VALUE '1 I ......___ __,o___,3_DAY A DALWY MAX ,__' ,,L _q,,IRON. TOTAL AMPLE19) 00(AS FE) MEASUREMENT 01046 1 0 0 ." .1911.0 10EFFLUENT GROSS VALUE ,, , ,,T -,_. .30DAY , .DALYMAKX

*LLEAD, TOTAL SAMPLE (19) So0(AS P,) MEASUREMENT 01061 1 0 0 '0.2 0G4 ........EFFLUENT GROSS VALUE 11V, --.BSIDY -MDALY MANICKEL. TOTAL SAMPLE -(2) (19) 500(AS NW) MEASUREMENT

(__ __ _1__ __ _ _010o7 1 0 0 .101014 ..0 2AEFFLUENT GROSS VALUE I --I.BSNDY I 31DAYA DALYX MDILY IRAWJME ICý5W w1d r d low s Io fJiormt Wd nt -WO i0n U 1im TELEPHONE DATEPAIN(lPAL mJEfClVE OF Ro o r W4-_a _ a a '. uoI *l a toasue no at puum_-qbsttad i 1A Me b*memla Bas ean oal M -of peNtmZZnse IBradley J. Adams WU sv&W uorsft pwms Isc al ra Wr go 9 to onns, go......

09 02 19.m t. r fa.in OF PRINCIPLE Pl anager &me m--amper m m g --b Ew me Pafavy EXECUTIVE OFFCER OR NUMBER YEAR MONTH DAY1MR P o. rAM D _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __,_J AUTHORIZED AGENT ___)E YEAR MONTHDAYCOUMMENT AND EXPLANATION O ANY VIOATON (Ae"r"I anl ....)1. Them was no ot processed steam generator dmss cleairg wasms water dwting fte moni.2. Flow eled lo INs oudal 12 of 31 days durig te monlhEPA Form 3320-1 (Rev 3MM9) S PAGE 1OF2 NATIONAL POLLUTANT DISCHARGE ELMINATION SYSTEM (NPDES)VISCMARGE MIOTORING REPORT (DUR)PERIMWTTEE NAME/ADDRESS NAME Exelo OGewation Co., LLCADDRESS 43W0 Wirdield RoadWarwnville, IL 60656UL0048313 PEFIUNT NUMBER001 oDSCK4ARGE NUMBER EOCROSOIMAJOR(DUMNOI)F- PEALWWTP (FORMER OSIC)... No UDcOMARE

.MOAfFORING PERIODIFACILTY Byro, F Nuclear Pwer Saton [OH DAY I YEAR I MNTHI DAYLOCATION 4460 Northi Genan Church Roed From: 0 J 9 0 0 TO: 0 1 9 0 1 1 3 1 1Byon, IL 61010I 0* oNATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)CN'A.GE NOWTOrNG REPORT (OU1)PERMITTEE NAME/ADDRESS NAME Ejloin Generation Co.. LLCADDRESS 4300 Wnfid RoadWafrenvilie.

IL 80556FACILITY Byron Nuclear Power StationLOCATION 4450 North Gemm Clhurc RoadBymn, IL 61010ILSOM4613 I PERMITNUMBR F -D01 01 DISCHARGE NUMBERI MONWTORIWG PERIODIYEAR IMONTH IDAY _j rYEA-R7 MONTH DAOCROS01MAJOR(SIuenO0)

F -FINALRADWASTE TREATMENT (FORMER 0OlD)EFFLUINT.**NO DISO~KAROE

...""From:I 0 I 9 I 0 I11 o01 1 I To:l 0 1 9 1 0 1 3 11" " " l l I II I l I I I I_________________________________________NOTE:

Read'iatcin

~Ire~ this temQUANTITY OR LOADING QUANTITY OR CONCENTRATION NO. FREUENCY PLEP____'_EROF TPAVERAGE MAXIMUM UNITS MINIMUM AVERAGE MAXIMUM UNITS EX ALY TYPESOLIDS. TOTAL SAMPLESUSPENDED MEASUREMENT (6 -05 <03 (19) 0 240 CP00530 1 0 0 P-RMOTW.

Is. *3Uy 1W.0YEFFLUENT GROSS VALUE R EM_1,____.

_ _'._ _:"._ _"_ _ 30 DA Y A OI#LY M AX M W-EEK Y .-OIL AND GREASE SAMPLEMEASUREMENT

2) _1.4 <1A4 (19) 0 240 OR03502 1 00 Fen -A -2"0 M~LWRY GEFFLUENT GROSS VALUE R" EQUIREMEN 30D AYAMM DLY MAX ,,______

-FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.022 0.003 (03) 0...... 135 ON60050 1 0 0 PEAT W "IGD-AYEFFLUENT GROSS VALUE RIE M*ET 3a OOyTV *A -DYSAMPLEMEASUREMENT SAMPLEMEASUREMENT SAMPLEMEASUREMENT SAMPLEMEASUREMENT

_ _ ____ _ _ ____PFUIPAL EMCUTIVE (OFFICER cdfactin or t son in aiddanwe

,mth a, t Wn 4In to eaor mted pWaannTE Ept0MV VaW and evakh t"Is e nedflon v umd. Bol an Maly d U pmm or -pea :81 406-370009 01Bradley J. Adamns s mansgo fta syum, 'w cfto mdmy rea-som & pe ga -g VMe Wd th e i0 02 t19v efitmIted I. to Ue begt di nmy Wed ad bold. bs, am.own",

and -,nlime..

fn SIGNATURE OF PRINCIPLE Plant Manager dietg tere amr agiffiperiedmus.m tfr enbwlate vwrftb, fte pmebfy d EXECUTIVE OFFICER OR AREA NUMBER YEAR MONTH DAYTrEoommw PI mi tVPltelOViwi alo "im vicoa- A Os AGENT CCOMMENT' AND EXPLANATION OF ANY VIOLATIONS (Rsae m ahet)hm.r.t...s)

1. Flow exmt thrgh this outfafl 4 of 31 daye dung the month.EPA Form 3320-1 (Rev 3/99) 8D PAGE I OF 1 NATIONAL POLLUTANT DISCHARGE EULMINATION SYSTEM (NPOES)InCHARGE MONrTOrNG REPORT (DUR)PERMITTEE NAME/ADORESS NAME Exelon Generation Co., LLCADDRESS 4300 Whl RoadWarnveie.

L60555FACILITY Byron Nuclear Power StationLOCATION 4460 Nort Geman ChUrh RoadByron. L 610101L0041013 I PERMT NUMBEREo0 0DISCHARGE NUMBERMONITORING PERIOoIER MONTH DAY YEAR MONTH I DAYFrom: 1 1 I 0 I I I 0 I ITo:10 0 9 9 0 1 11 3 I 1 1MAJOR(BWunnI)F -FINALSIOWIUN(FORER 0015)STORMWATM

-NO mISCiNAFII I I I

I INOTE: Read Instruction c Jtwn ft1forOUAm'rY OR LOADN OUATT ORhn' CON NO. FREQENCY AMLPARAMETER EX OF TmPEAVERAGE MXJM UNITS MIIU AVEAG MAXIMUM4 UNT ANALYSISPH SAMPLE 12) 500MEASUREMENT

--(2 000400 1 00 06.0 ,0 SEEEFFLUENT GROSS VALUE .IORdM .li~l .. MIIMI

wa ,,. PEIMITSOUDS, TOTAL SAMPLESUSPENDED MEASUREMENT(19) 50000530 1 0 0 FaW LBS)Y 1 3. EEEFFLUENT GROSS VALUE U .T 3DAYAW DAILY -AX MG-. PE -TCHROMIJM, HEXAVALENT SAMPLE (6 1 m(AS CR) MEASUREMENT

( __) (19) 50001032 1 00 0PERMIT '. all 0.2EFFLUENT GROSS VALUE UW, -LDSY -- DAY, AVG W&Y MAB,CHROMIU TOTAL SAMPLE (1) 500(AS CR) MESRMN _ -- () -_)01034 1 0 0 PEMIT t 2.0EFFLUENT GROSS VALUE ,.,- -, 2: 3 LOWBY MG&. DALYS 30 OAM AVG DAILY MA"...COPPER, TOTAL SAMPLE(AS CU) MEASUREMENT 2_) (19 () 50001042 1 0 0111111T LOWY5 1,0 DEFFLUENT GROSS VALUE IX1 -- 3. DAY AVt 0MYIMA IMGA DALYY VAIRON. TOTAL SAMPLE ( 5(AS FE) MEASUREMENT

-19)01045 1 0 0 PEMIT * .WG/ DALYEFFLUENT GROSS VALUE , TAREMInl ff -Y DAY A, .1.0Y,.LEAD, TOTAL SAMPLE(AS PO) MEASUREMENT (26) (19) 50001061 1 00 P &2 " 0.4...-- LD,.DY iDW **IY .GRASEFFLUENT GROSS VALUE RIJIREE IT -.- DAILY MAX .,.......,,

NALIey J. ma me.,fo- Ot. -.. me memm, M-11 aw TELEPHONE DATEPIHNPAL EXECUThfE OFFtCER -l w of sMpeWVv m in aodm T a s"Mem 1wqres 1 m w qs peiMW ei ' 1 1getter aid Owwwo ev 5 tomft. woi Sow an av bquby~ dmem or%, 815 408-3700Bral~ey J. Adarns mm mmm vfml ftys mar&=*pwm dmc 1~~e 11 fwpmmq~k*0mmfte 09 02 19vftmm~ a1d to b*Ns m I os0eded t. b tr. m id IIms lam SIATUAE OF PRINCIPLENA PlanManagr m O meeamiqlamg

", fotgAnfirgtmel knnidim Sw* "" EXECUTIVE OFEROR NUMBER YEAR MONTH DAYiWOmD~ ml FM F11IE~O wQm. AUTHORIZED AGENT NME YEAR MONTH DAYCOMMENTS AND EXPLANATION OF ANY VIOLAlIONS (ftsewe ad aftechments hem)1. No Tuolne builing wstewater was dslcharged to the Sltanmwter Runofl Basin durng fte mona2. Them was no discarge of processed sam generator chemical ew"i wastwater ding fte monft.Th. Ts dcha poi was not used #ft moh.EPA Fomm 3320-1 (Rev 3W9%) 8D PAGE I OF 1 NATIONAL POLLUTANT DISCHARGE ELIMWATION SYSTEM (NPOES)WSCýARE MOTOINO REPORT (DU)PERMITTEE NAME/ADORESS NAME Exelon Generatio Co., LLCADDRESS 4300 Wifmisd RoadWarrenviwi, IL 6068FACILITY Byron Nudear Power StatioLOCATION 4460 Nor German ChUr~h RoadByrn. IL 61010RA04N13SEWT NLVAERI E01 0I DISCARE NUMBEROCROSOMAJOR(SUBIf0l)

F -FINALSTOANWATER(FOMER 0015)STO1MWATER I MONTORING PERIODYEAR I MO l .I DAY YEAR I MOI HI DFrom:I 0 I 9 I 0 [ 11 0 I 1I To: I0 19 10 11 13 11 1..NO 00cHARGEC]

I PERMITTEE NAME/ADDRESS NAME Exelon Gerwation Co., .LCADDRESS 4300 Winfield RoadWarrenville.

L0FACILITY Byr=n Nuclear Power StationLOCATION 4450 Nor Geaman Churc RoadNATIONAL POLLUTANT DiSCHARGE EMIHNATION SYSTEM (NPOES)-OHRI UONWOUNO REOR (UR)1L004633 001 0PEMI NUMER DIOCHARGE NUMBERMONIORING PERIODIYEAR I MONTH I DAY I I YEAR I MONITHI DAYOCR0solF- FINAOOOLiN SYSTEM BLOWDOWN... NO DSCHARGE EJ.I -+ I -,, -- I -. II I -. I -. !From I 0 I 9 1 0 I 1 I 0 I1 I To:l 0 1 9 I 0 1 1 1 3 1I I1m p m m I I FByron, L 61010NOTE: RalimsXO~

onitn hsfrQUANTITY OR LOADINGOR CON ION NO. FREQUENCY SAPARAMETER AVERAGE MAXIMUM UNITS kvMdUM AVERAGE MAXIMUM N XS A F TYPSSAMPLE8.40

--&.77 112) 0 240 EMEASUREMENT 00400 1 0 0 7 EPIRW -7. --amEFFLUENT GROSS VALUE M * -.-, --IS WEEKLYCOPPER, TOTAL SAMPLEs(AS C MEAUREMENT_(_)--(_

01042 1 0 0 P " Y ."I. WEE.Y IMFEFFLUENT GROSS VALUE -DAILY MAX-..-ZINC. TOTAL SAIPLIE 205)0(AS zN) MEASUREMENT

) (19) 24 R01092 1 00 0 **.W 10EFFLUENT GROSS VALUE d .. ..... -- L YLY -MX M. WEEKLY GMOXIDANTS, TOTAL SAMP.E (19) 50RESIDUAL MEASUREMENT

-34044 1 0 0 PMIT Limy -GEFFLUENT GROSS VALUE T _____-- --FLOW. IN CONDUIT OR AETHRU TREATMENT PLANT MEASUREMENT 19.66 24.93 (03) -- --136 CN50050 1 0 0 PERMI T " RBWRTEFFLUENT GROSS VALUE FA. ..YuITYY MOD DAY -M DALY "XCHLORINE.

TOTAL SAMPLE -0.0s 0.4 19) 0 240 ORRESIDUAL MEASUREMENT

--50060 1 0 0 I ý LSIDY 062 MOL WELY GREFFLUENT GROSS VALUE .--. ... ..-- DAYA D A..LYMAX.

---...HYDRAZINE SAMPLE (0 0A, MEASUREMENT

.... (N) -(19) 50081313 1 0 0 PERMI OT4.YWEN

_EFFLUENT GROSS VALUE OIS --S"Y -DDLV.. iOSCHMMIGa PfP0AE3CUTIVE OW1CER .iarbvwin accw a ~spwaan ma,. nW0 pm.aWi 3___POW sA hi a- I I fmi W uIn h O aini". ii d ""IIop-BanMU~mMOku~ kyd tO 6 15 406-3700 10radley J. Adams h o~ abe or those POms 1 mqpe~m tar go W2 q ft I " Wab ,the "09 02 19s*nftd L to to bed d Ie .m b"l. mur. m d.Mirm ce l. I am SIGNATURE OF PRINCIPLE Plant manaer ow Iwor we soiJtart pU~m 1M4for &Aft e & ftWo " f~tO I dm EXECUTIVE OFFICER DR NIURYA O~ ATV4)ifa vkmPmIU'Ulrkm6

-bi I AUTHORIZED AGENT YEA___NTH DA AND EXPLANATION OF ANY VIOLATIONS (A m-nee dl aaanmhnrte here)Per Special Condrion 4C., the nadmn allowable blowdown temperture caculation rest are pmokded on the allechmen SEE ATTACHEDEPA Form 332D-1 (Rev 3A19) 8D PAGE I OFIB0 0NATIONAL POLLUTANT DSCHARGE EIINATION SYSTEM (NPDES)DISCHARGE MONOTORINO REPORT (DMA)PERMITTEE NAME/ADDRESS NAME E iln Generwation Co., LLCADDRESS 4300 Whralld RoadWarrnville, ILFACILITY Byron NudearPower StationLOCATION Norh German Chunh Roadyrn. IL 61010IL0040313 PERMIT NUMME0020WSISARGE UMA4ER 7OCROB01MA"O(BUDA 01)F-FNALSTORMWATER RUNOFF BAMN OVERF.OW8TOfWATER

- - NO OISCHARGE r' ...I MONITORNG PERIOD IYVEAR MONTHI DAY j YEAR MONTH DAYFrom: 01 9 0 11r0 Ir l To:l 0 0 101 3 111NOW: Readcl k oeole this formOUANTITY OR LADING MITY OR COTRATION NO FREOUENCY SAMPLEPARAMETER AVERAGE MAXIMUM UNITS MlNMJM AVERAGE MAXIMUM UNITS EX ANOYSYSPH SAMPLE 12)MEASUREMENT 00400 1 00 LO S'O SEE6.0EFFLUENT GROSS VALUE F IT- -maM ______ MAJU.M PERM___SOLJDS, TOTAL SAMPLE 26) (19)SUSPENDED MEASUREMENT__

00530 1 0 0 -P- Lamy ISt -M0 SEE GRASEFFLUENT GROSS VALUE W IT 15.0,, ,,S ,E..I.CHROMnJI1, HEXAVALENT SAMLE(AS CA) MEASUREMENT 01032 1 0 0 PERMT -0&1 02 DALY....EFFLUENT GROSS VALUE FA- -LBWDY 30DA(V DAYMX MOIL IA. GCHROMIUM TOTAL SAMPLE (19)(AS CA) MEASUR-ENT 01034 1 00 POW- L Y -1.0 2M. 0MVLYEFFLUENT GROSS VALUE " U _ _ __ _ 30-DAYA..

D".Y...-OOPPER, TOTAL SAMPLE-- (26) -(19)(AS CU) MEASUREMENT

_ __)01042 1 00 0 .pE.r Lamy .5 1.0EFFLUENT GROSS VALUE R mIT-- -. ....-3 bUY M M,. IWYLYIRON. TOTAL SAMPLE-(26) -(10)(AS FE) MEASUREMENT 01046 1 0 0 PE R- LBS/DY 1.0 1Is WIEFFLUENT GROSS VALUE 091111113W I____ I____ ____ 30WAVRS DALMAX M DL HLEAD. TOTAL SAMPLE(ASP 9) MEASUREMENT 01051 1 0 0.PEMTLS 204 MIDAY oEFFLUENT GROSS oLUE -nr -EsAM -L Y -02 04P MCIPAL E XECtUfl E OFFICE A N or a upoviom ,c ~ '- w a -'m da pu .'J smaui ~ r peso we Q1d 4 1DATBradly J. Adams aft nm l smm@..IImU"Sy IS I ' a "oi we'a, k9r1e 406-3700 9 02 19mebxftw is. my d nq .N i , 4 Nut b" tw, = ad', O. -tu UT OF PRINCI ..PLEianntMansiper pmtw~tn sub"m ln"- fat Ntt yT FR YEAR MONTH DAyrtVW OR PA94TW I', 10m I " -AUTHORIZED AGENT YEAR MONTH_ I DAY____Com0m AND EXPLANATION OF ANY VIOLAOnSO (eurenes al at-,,meants hers)1. No Turbine "u fdwasteower was sKoaid to me Slomniabr Runoff Basin druft the month.2. This ischarge point was not used Me nth.EPA Form 3320-1 (Rev 3 SO PAGE I OFs2 NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DICHARGE MUrOMOINO REPORT (Di)PERMnTrEE NAMEJADORESS NAME Eaxel Gewamon Co.. tLCADDRESS 4300 Winfihid RoadWarrivill,

s. 608IL004MSSPOw NUBE0020oMAJOR(Buenos0)

F- I4ALSo UWA1UR RUNOFF SAMI OVERFLOW81 WWA1ERto. NO DOWARGEMONITORING PEIOFACILITY yui Nucler PowerSti YEAR I MONTH DAYLOCATION 4450 Noh German Church Road From: 0 9 1 0 I0Byron, IL 61010-j I YEAR I MOM I DAYI To:l 0 I I0 1 1 1 3 1 1 1 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit UL0048313 January 2009BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)01/03/0901/10/0901/17/0901/24/0901/31/0912012012012012073.270.870.263.972.4Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of January 2009.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byrtsh~byrodt~ckk\MonthyDMR\MacdO I U=09 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit HL0048313 January 2009COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.0k:byr-ch~byrodbwckr\MonyD yM R~agtad2IjanO EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION

________(Minutes U! U-201/01/09 20 2001/02/09 20 2001/03/09 19 1901/04/09 20 19HALOGEN DOSING CURVEConcentration of total residual chlorineihalogen vs. minutes of chlorination period.Date: 01/02/09Time: 12:31Analyzed by: M.D.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.000 25 50 75 100 125Mlnutes150 EXELONBYRON STATIONPermit -.0048313WEEKLY HALOGEN DOSING INFORMATION 0(Minutes) 01/05/09 20 2001/0609 20 2201/07/09 20 2001/08/09 20 2001/09/09 19 1801/10/09 19 2001/11/09 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 01/08/09Time: 10:07Analyzed by: M.P.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260240.220.200.180.160.140.120.100.080.060.040.020.00025 50 75 100 125Minutes1*

EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION QaM Do ~np im(Minutes)

U- 01/12/09 20 2501/13/09 20 1901/14/09 15 2001/15/09 20 2001/16/09 20 2001/17/09 20 2001/18/09 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 01/12/09 Analyzed by: D.B. Unit: 2Time: 10:16 Reviewed by: D. M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.42 40.400.38 i I',0.32 I I i,0.360.30 I0.28 MB0.260.24 2i0.2020.16 I0.14 -i I0.12 I,0.10 i I I0.080.06 I0.040.02 '0.000 25 50 75 100 125 150Minutes EXELONBYRON STATIONPermit [L0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes) 01/19/09 20 2001/20/09 20 2001/21/09 20 2001/22/09 20 2001/23/09 20 2201/24/09 20 2001/25/09 21 21HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 01/21/09Time: 10:22Analyzed by: J.W.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.04,0.02.0.00-0 25 50 75 100 125Minutw EXELONBYRON STATIONPermit I.0048313 WEEKLY HALOGEN DOSING INFORMATION DosinuTme (Mintes)01/26/09 20 2001/27/09 17 1701/28/09 20 2001/29/09 20 2001/30/09 20 2001/31/09 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 01/26/09Time: 11: 10Analyzed by: T. M.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/I. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.04025 50 75 100 125 150 175Minutes NenExel'ne

.Byo ttoxlnGeneration Cornpany.

LLC. Nudear8yron Station4450 Nowth German Church RoadEyron. IL 61010-9794 March 19, 2009LTR: BYRON 2009-0032 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit NumberIL0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forP Byron Station, Units I and 2. This report covers the period of February 1, 2009 throughFebruary 28, 2009.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradleyms Plant ManagerByron Nuclear Generating StationBJA/ZC/sdk Attachments NATONAL POLUTANT OSCHWAGE ELIMINATION SYSTEM (NPOES)01SC1ARGE MONIOTOW4 REPORT (OiR)PERMITTEE NAMEJADDRESS NAME Exifo Genem0on Co.. LLCADDRESS 4300 Wm*Id RoadWarmiwis, L SIMFACILITY Byron Nucir P r StationLOCATION 4480 Norh Geman Ch Road&yro. IL 61010I OO4SISI PEMI NUMBERI AM 01 DISCHARGE NUMBERIIMOTRIG PERIODYEAR IMONTHI DAY__ YEAR MONTH IDAYOCRom0MuonMSusa 01)F -mIALDEIEALI REGENERATE (COlA)EPLFIAEN.&. NO DIo4ARIFrom: 0 1 9 1 0 1 2 1 0 1 i TO.! 10 1 2 1 1 8 1S_NOTE. Red Wiallm Ware Col. oma"formPAATR ITYOR LOADING OUJAM OR CONCENTRTIONO FREQUENCYS AMUNITS IIMUM AVERAGE MAXIMUM UNITS A ALYSISSOUDS, TOTAL SAMPLE -2() 0.6 0.6 19) 0 285 ECSUSPENDED MEASUREMENT 00301 0 0 LB63D 1, OH.0MEFFLUENT GROSS VALUE R- T _____ ______ __________

LM 1M. Cam".CHROMU HEVENT (E(AS CR) MEASUREMENT

-__(__ (___013210 wLSSIDY -GRAS2EFFLUENT GROSS VALUE MW -.. -ALY , oAYA , ,, ,, -o_. ___. _ ,HROMIM TOTAL SAMPLE (19) Soo(AS OR) MEASUREMENT

--01004 1 00 -RY -1.0 2.0EFFLUENT GROSS VALUE PnMMEnilr

__7__= I____ 3~AsDYM -DLCOPPER, TOTAL SASPLE --(ASCU) MEASUREMN-() --1 (1) 0001042 1 00 0*, ..Y -..0 "EFFLUENT GROSS VALUE _________

....._ _ .... ,,, YAW ., YMB _ _,IRON. TOTAL SAMPLE -IAM --MA(AS FE) MEASUREMENT

-(2) -(1) S0001046 1 00 -laS~ .1A0EFFLUENT GROSS VALUE _________AW' v lo mw UGAYw 0.Ym3( MLEAD, TOTAL oAW .E- '" "(AS P) MEASUREMENT

'-' (2) -(19) S0000 11 00IBSIDY

.G& DALMY iK .AEFFLUENT GROSS VALUE F-. ..... -. , -_ -- , ........_-_"-NICKCEL.

TOTAL SAPL (1 2500o(ASNO) MEA-UREMENT 1 19Bradi.. J. AdaM the Ir -or pum dpwft o f8151 406-3700 09 03 191. Them lus no dla:haug e 0 p e aare genamator chslcaI d lg fal wate. ftrf nO ha on .2. Flow 1Aed 25 d 28 daeyps dur Odfs mont'.EPA Form M" SO PAGE"Aý a SNATIONL POLLUTANT DSCHARGE EULINATION SYSTEM (NPDES)DSCRG UOUTORWN REPORT (OUR)PERMn'rEE NAME/ADDRESS NAME Exaon Generaton Co., LLCADDRESS 4300Winfin'd RoadWanwmls.

ILOMSFACILTY Byron Nucsar Powe, StaionLOCATION 4450 North Gemian Church RoadByron, IL 61010ILCOOS13I PERMIT NUMBUERA01 0I DISKARGE NLIMBERMONWRNG PERIODYEAR IMONTH IDAY YEAR TMONh __DAYMAIJOR~lF. -EALDOWERALZR REGENERATE (001*)1100 NO SONARGE ..From:I 0 1 9 I 0 1 2 101 1 JTwo1 01 91 0 121 2T1SI...... II

I *

iI NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)DICHARGE MNOTORING REPORT OW)PERMJWrEE NAME/ADDRESS NAME Eealon Generation Co., LLCADDRESS 4300 kWd ROad L 60655FACILITY Byron Nucler Power StatioLOCATION 4460 NOr Gsmann ChrC RoadByomn, L 61010ILOO01813 PEMI WMUMER1 8,01 0I DISCARGE NUMIERMONITORIG PERIODYEAR MoN I I YONTH I DA Y I 2 I M I DAYFrom 1 0 19 10 12 1011 1 Tol 0 10910 12 12 181OCIR0611MAJOR(9U3R0)F -FINALSiPEWFLIIBIT CPOER 0011)... no00 0SHA0MENOTE: Read ksluco O this monOUANTITY OR LOADING U OR TION NO. FREQUENCY SAMPLE

-,OF TPAVERAGE MA)IMUM UNITS MONM AVERAGE MAUM UNITS EX ANALYS PEBOo. &DAY SAM..LE(20DEG. c) 0.15 0.17 (20) 2.5 2e 19) 0 290 DC00310 1 00 LOWY ....LBi- MM.EFFLUENT GROSS VALUE .FIMR_30.__r W .. AVG; M.M. , 7. AVGMAXPH SAMPLE 727 7.59 (12) 0 290 GRMEASUREMENT 094001 00 PEFMT,` an jvvm TIEFFLWENT GROSS VALUE SU__- _ __,MSCOLDS, TOTAL SAMPLESUSPENDED MEASUREMEN 0.14 0.19 (26) 23 z.e () 0 290 De00m0 1 00 .14.2 .i.Y ..M .ago MEFFLUENT GROSS VALUE TWDY , o.Y M .... DMMG/X a00NTfFLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.006 0.010 (03) -- 1 05 CN50060 1 00 41- ,*w1 ARM.EFFLUENT GROSS VALUE 4131 3r .01W AVG ,, ... -SAMPLEMEASUREMENT SAMPLEMEASUREMENT SAMPLEMEASUREMENT I______ ___ ________HMLE I coify km op pualy ofw to am dcft"An r~d an mu TELEPHONEta~

m DATEPteWCWAL E2ECAWME OFF#=R or sain I aMg a a',,un 10uu l inmainuS dmw m ____ ____________

glw wil "ev" f low "ffm"O s~aw.S an WN ki~* d we paWo pumaBracilsy J. AdaMs -Wq ft £sym. orS V-0a wm oft nkmaft s I " awg fe "I~m obr w 4030 0 3.b0b~toUbo Emy a~~.g. aw bea.Uw1n.

ma wdI oAise.mu SIGNAC OF PRINCIPLE 1PAM USQ 'am U. ~ " 6m p mo~ies w" twoeI koln kq the pmeb" o EXECUTIVE OFFICER OR AR:EANM YR OD-t Rpppr aO eiinoe i fr kw*Q ~omusa AUHRIE AGNIO UBRYA OT ACOUNWII AND EXPLANATION OP AY VIOLAflONS Plauioeg all attaemmnts ot)1. Flow eilfled Irough iins outfall 2 0128 day A g Utis n iontl.EPA Form 3320-1 (Rev 3" 8D PAGE I OF 1TS NATIONAL POLLUTANT DSCHARGE EULMNATKON SYSTEM (NPDES)DICHARGE MOITORING REPORT (DMR)PERPAWTEE NAMEJADORESS NAME Exelon Generation Co.. LLCADDRESS 430 Winfield RoadWaffenve, L60665FACILITY By MNucleaPower StationLOCATION 4460 North Gemian Chuih Roadyron, IL 61010I .....I IL0048313

-IIcl 0I .... I" -Ii PEMji DISCARGE NUMERMOi.TORi

.PERIODYEAR IMONTHI DAY j IYEAR IMON-HT-h DAYMAJOR(B1unn01)

F -FINALWWTP (FOIRU 0010)... NO SOmHARGE...

Frm: 1 0 9 10 1 2 1 0I I 1 To. 1 0 1 9 1 0 1 2 1 2 1 8__________

NO~~~TE:

Read'ht~oshfr sWrOUANTITY OR LOADING OUANI4TTY OR CONCENTRATION

_ _No. FREOUENCY SAPL-AX OF TYPEMAoEA MAXdMUM IS AVERAGE MAXLM UNITS E ANALYSIS--AL -(26) ---- 0.9 2.0 (19) 0 240 DCSUSPENDED MESASUREMaENT0 00530 1 0 0 L y t1. 0. 'aEFFLUENT GROSS VALUE F. -- ... --... Y -- " PA.V. WEEIOY (MI"=.CHROMIUM.

HEXAVALENT SAMPLE (29) So0(ASCA) MEASUREMENT

-01032 1 0 0 -0.1 0.2EFFLUENT GROSS VALUE .LSIDY -D "YAVG a w.OmlX MDM DALY 'NMI_CMROMU TOTAL SAMPLE ()19 So(AS CA) MEASUREMENT

-(26) -01034 1 00 0"" .. 2.EFFLUENT GROSS VALUE J'Al --LBSI3Y DAA DYMAX waOOPPER.TOTAL b(ASCIU) MEASUREMENT

-(19) 50001042100 few- -DI.Y -..MEFFLUENT GROSS VALUE fMU ____: Lam _D;AYAVG DA,. .LX& MD. ---'RON. TOTAL SAMPLE (25)(AS FE) MEASUREMENT

-01046 1 0 0 py " -1 1.EFFLUENT GROSS VALUE "n InI -A. -MAXLI.. t. _"LEAD. TOTAL SAMPLE(AS PS) MEASUREMENT (26) -(1)01061 1 00 M. --%,EFFLUENT GROSS VALUE 0. -- -- -tY.NICNEL, TOTAL SAMPLE (19) Soo(AS NI) M-EA- ()(EM01067 1 0 0

RM'17- 20EFFLUENT GROSS VALUE 1. -- 4-- -, 311DY1 : MM.AiiYk

.A1 BI'AMENMIE I cer tod o -o d low um gon 44#A ums{Lb TELEPHONE DATEPANCPAL EWCUTIEtOFFCER arswmn .. s Ie w a "SOM gn to asrO 0udtd pwwI tnnBradley J. Adams oeaq.wam.

o mewI. wpsm $ III 0W gw bvf'i1bmnwm, rt 8151 4037 09 03 191____ _ __

___ _A__AT -YEAR MONTH DAYCOMMENTS AND EXPILANATION OF ANY VIOLATIONS INmhssall I Itahet hure)1. There wasno discharge ol -1pRAce steabm genetor chefWmiaclaning WsteWater datig 04s montiZ Flow existed Urouh oAM i1 of 20 da" ft"ng fte month.EPA Form 3320.1 (Rev 31 ... SO PAGE I OF2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DIHARGE MONTOAINO REPORT (DUR)OCROSMPERMITTEE NAME/ADDRESS NAME Exelon OGneration Co., LLCADORESS RoadWaemnvile.

IL 605SsFACILITY Byron Nucler Powe StationLOCATION 4450 Norh GOMnan Chrch RoadByron. L 61010I ILOHM3I IW 01II PERMIT UM1 1 DISCHARGE NUMBERMAJOR(3Jum01)F -FINALWWTP (FORMER OMC)EFLwfMONITORIG PERI-ODAY WM1 YEAR IMONTHI DAYFron: 1 0 1 9 10 12 I 0 1 1 1 To:I1 0 1 9 1 0 1 2 1 2 1 8 1*NO. DISCHARGE m ...NOTE: Read kilm foro convif afta formOUATIT ORLAIGOATT O OCNRTO O FRECUENCY SMLPARAMETER ER OF rim> -< AXIUM UNITS EX ANALYSISZINC, TOTAL SML(2)(19) 500(AS ZN) MEASUREMENT 11.0 1 0 0 .,1 , .EFFLUENT GROSS VALUE 3_ _ DAY_._ ING _- -MSOUJREASE ' (26) -1.S 3.0 (19) 0 240 OR03M 1 0 0 11" 2.0--LDSIDY -WEI.EFFLUENT GROSS VALUE ---_,,,__-

...._._ ..... _ _ _ _FLOW, IN CONDUfT OR SAMPLETHRU TREATMENT PLANT JREASUREMENT 0.024 0.039 (03) --0 135 TM50060 1 0 0 palm .WII LM DA.,YlNTtX EFFLUENT GROSS VALUE ..1 D8 MOO -- --- " LY TOTAiJWSAMPLEMEASUREMENT SAMLEMEASURW _WSAMPLEMEASUREMENT___

__ _____MEASUFREMENT"

... P E u "if ., -..... .., 1 .,, I.. .. -.., :

I .... 1. , ., .NA4AE/1TFTLE LIMPy ihid O kwy Ii fta doe~wwi id40 gz AMOn Apn pmpd ~my" ...ALO.CUTIW .-.a-.. ,wd .TE"EP* " NE DATEoraw asim avl C A h ~ mai -ya I t aspi smyWh i qpusa I tpwmare" J. Adsi*s f W f '0 S PW b t argWI &*M f 09 03 19:alfW~i~ba acfVabeat fla y-seadbes u.m. I'm lar~ n SIGN4ATURE OF PRINCIPLE_________

Plant Mwng% am Owm an itdg ma pw" for w na limum to l iln 1 ofl EXECUTNE OFFICER OR AREANUMBER YEAR MONTH DAYMFlWA NW _ _ _ __ _ INN to __N E R TCOUAMBIS AND EXPLANATION OF ANY VIOLAlOWS (RWhrsncg anwm~a here)EPA Fomi 332D1 (Rev 3M%) so PAGIE2" 0NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPOES)DSCHARGE ONITORING REPORT (DUR)PERMrrTEE NAME/ADORESS NAUE Eimlo Genration Co., LLCADORESS 4300Winfid RoadWarrfevufle, IL 60W55FACIUTY Byron Nuclear Power SlationLOCATION 4450 NOM German Churo RoadByron, L 8101011L0048313 PEMWr1 NUMBERIDc" 0I DISCARGE NUBEOCRO5O1MAJOR(SUJR 01)IF- PUALRADWAOTIETREATUIBIT(FOREROGID)

... NO 0CHAWEE ....MONITORING PERIO0YEAR I DA" YEAR IO , DAYFrom:l I 9 I0 1 2 1 0 11 ToI 0 1 9 1 0 1 2 1 2 1 6 1 PERMITTEE NAME/ADDRESS NAME Exelon Generation Co.. LLCADDRESS 4300 WinfieMl RoadWarrenwi, IL 60656FACILITY Byrot Nuclear Power StationLOCATION 440 Nor German Church RoadByronm IL 61010NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)D -ctARE WOT (PMA)IA08I1SIS E01 0PEMTNME I OISCKRGE NUMBERI MOWrORING PERIODYEAR MONT, DAY I IYEAR MON" DAYFom 0 1 9 0 12 1 0 1 1 To:1 0 1 9 0 12 2 8 8MAJOR(SUOm b1)F -FINALSTORWATER (FORMERO001)

STOREWATER 0.NO D18(4ARGE PARAMETER OUANTITY OR LOADINGIAVERAGEUNITSPH SAMPWLEMEASUREMENT 0040 1 o. .0EFFLUENT GROSS VALUE J-lý,.SOLIDS, TOTALSUSPENDED 00630 1 0 0I=m I Ir" CYI rfLW, UAk I ICSAMPLEMEASUREMN (26)LwDSIYCHROMIUM.

HEXAVALENT SAMPLE(AS CR) MEASUREMENT 2_) ___(_)01032 1 0 0 .--,SY-EFFLUENT GROSS VALUE Lamy__..

..-,-CHROMIUfM TOTAL SAMPLE(AS CR) MEASUREMENT

-- (2)01034 1 0 0 ! T- LDWDY-EFFLUENT GROSS VALUE _______ _______ -0OPPER. TOTAL SAMPLE(ASCU) MEASUREMENT(0) 01042 1 0 0 alpEFFLUENT GROSS VALUE , T .sD,IRON. TOTAL SAMPLE(AS FE) MEASUREMENT

-01046 1 0 0 _EFFLUENT GROSS VALUE _______ 'LEAD. TOTAL SAMPLE (,,,(AS PS) MEASUREMENT 01061 1 0 0 LBmTDEFFLUENT GROSS VALUS : -- WDY -,.WIITTLE elf* u do F 1) c MlwUof d0aWWir Wd Ad Woe$n -0 ,ipi %ftwSPI TPAL ECTWE IOFRER OF* parvtom In Is -c. -mf a sydms dgmpleds mlc s mldo und ns/g~MW aew evlMS me kMwn~ui ambSee -1'W pa, peaws'Bradley J. Acdans o ma twam. oMme par mmo ve f pmww forpo ,M fithnlmmi a&*waed i. mng bh0 erm Mlad0e adf bad. bus masts. ad oW , InPlant Manager Mar Mist se am 'ict pewUee a I~m abre tr kvimstmi MUi ICOMMISI AND EXPLANATION OF ANY VIOLATIONS (RIebre as l eltmchneresderhu)

1. NoTwbft~¶ biI*g waaaints was deschrged to toe ftSaonwer Runoff Baasin darng; the onfli2. iets was no dscharg cloceseed steam osneralor chemical leatn wasowawter aing fte month.I3. Flow 9AAW migjh Otiii"sa 3 of 29 dilm Am teonth.I(EPA Form332D-1 (Rev 3/9 SO AEDWAb aAGE.

00NATIONAL POLLUTANT DISCHARGE ELMINATION SYSTEM (NPDES)nISC6ARGE UOITOWNG REPORT (OUR)OCR0S01PERMITTEE NAME/ADDRESS NAME Exlon Generabon Co., LLCADDRESS 4300 WlfieVl RoadWavrefivhe.

IL 6068MFACILITY Simn Ncicsar Power StatenLOCATION 4460 Noth Gemian Church RoadByon. IL 61010IL0040133 PEMfiT NUMBER1=1501 0-ICHM NUMBERMAJOR(GUOR 01)F- INALSTOWMIAIER (FOFER OM E)STORWAIUR

.-NO DSCHAROE...

I MONITORING PERIODYEAR M-OMTH DAY I YEAR MONTH IDAYFrom: 0 1 9 0 1 2 1 0 1 I IITo:I 0 I 9 I0 I 2 2 I I41 NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DISCHARGE MONIORING REPORT (D"R)PERMIITEE NAMEIADDRESS NAME Eola Generatin Co.. LLCADDRESS 4300 VW RoadWsfTwilt, IL 60686FACILITY Byron Ndoar Pwmw StationLOCATION 4450 NOM Germn Church RoadByrn, IL 81010IL0048313 PEMI NUBE001 0I MONITORING PERIODYEAR MON.T: D I I YEAR MONTH DAYFmmr: 0 19 0 12 10 1 11To: 10 19 0 12 2 16IF-PUALCOOLS SYSeM SWLOWDOWN NO DISCHAnI

[MOUAHTTTY OR LOADING OATT RCNETAINN.FEUNYSML PARAMETERAVERAGE M UNTS AVERAGE MAXMUM EX OF TYSEMIIUMIANALYSIS "PH SAMPLEMEASUREMENT

---. _ -- ._1)40040010 1 o ..... Z ---..i.s.... , : -.::j ... I: -: :ý g l m , i, s w lEFFLUENT GROSS VALUE 1-4186 T ., -_____7_____

_____ 7____CJOPPER, TOTAL SAMPLE -.(AS CU) MEASUREMENT

-- -(U) --5001042 1 0 0 WPERMIT amEFFLUENT GROSS VALUE ý,Ffimwwkw

.... .. :?777ZINC, TOTAL SAMIPLE(ASAZN) MEASUREMENT

__s) _ -- o,___ o ___ a01060210 0 -lie__EFFLUENT GROSS VALUE .._ .... -.OXIDANTS.

TOTAL SAMPLE 26)RESIDUAL MEASUREMENT

--) -- -(_ _)_-- _ ___ ..34 4100- LBSIY OAS MG& WEEIC"VEFFLUENT GROSS VALUE 'Al+-l' ; ' " -FLOW, IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 19.09 25.6 (03) -0 135 -50050 1 0 0 *W PCRIEFFLUENT GROSS VALUE .6 F ________3

_ __ ,_ _ _ ommCILORINE.

TOTAL SALE --0RESIDUAL MEASUREMENT (2_) 0.0_ 0.2_( 1_ 0 240 GO_60090 1 ,0 0 W, MeT " .... 0i2EFFLUENT GROSS VALUE , .-A.-- ., L..I I .HYRZNESML (26) --(9) 5oEA MEASUREMENT 61313 1 0 0 '. "y 'W"".. '"EFFLUENT GROKSS VALUE I: lFME , _. ,. .+:<+ ...KMArIIWTLE mWv wt0 Oft dllf odWAiul~d "m F mw I~ I. TELEHON DATEmPFW40PAL EIECUr ,FFIM o sAIM+ in , IwI ce wwa a ""n ..9 1 ".guW maindatt kfmw manakeibd~

Boo -~ aw mwish di 11* pee vBWadey J. Adams we w. eOWN or wIm pam I*mcwi g sOmeIe ft 09 01ea~bU~dW.

o Se bat my~ N bd. S. aeaw. $ocn.eg SIGNAYR OF PRINCIPLE__________

Pmant Manager ato twoe e 0 M,, ,- -: pwa fm too nw.,% kam,

q ft N EXECUTIVE OFFICER OR g "Em r m~~ .,O AUTHORIZED AGENT YEAR MONTH 1OAYCOUWETS AND EXPLANATION OF ANY VIOLATiON (Asaenerea adteuni hers)Per Special Condidon 4C.. tO mauxmum allowaWls bIWdowlr tnepeatum cabcujalon resuae are povmled n antMeSEE ATTACHEDEPA Form 3320-1 (Rev 3W9) SD PAGE , I NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DsCHAOu E MOWTORNo REPORT (DUR)PERDAITTEE NAME/ADDRESS NAME Emon Generation Co.. LLCADDRESS 4300 WWHfls1d RoadWarrewil, IL 6055FACILITY Byron Nuclear Powi StationLOCATION 4450 Nort Genman Church RoadByron, .IL 61010IL0048313 wEA NUBE-002OISCHAAGE NLAEMM106OR(SUBU 01)F- P34*1STOMWATE RUNOFF BABIN OVERLOWSTo WATER.. *O 0101G MX ..YMONITORING PEROWADAMNH Y YEAR IMONTHI DAYFrom 1 0 1 0 1 0 1 2 10h 1 1To:j 0 1 1 0 12 12 181 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)DSCHARGE MONTORMN REPORT (PM)PERMATTEE I4A.EJADORESS NAME Exeb GOwation Co., LLCADDRESS 4300 Winfio" RoadWarrsnvill.

IFACIIJTY Byron NucmPow Per StaonLOCATION 4450 Nof Gemnan Church RoadByron, IL 61010I tLOi0li11 I I0020! _ I----I PEIn NUME I IDSCHRGE NUBERiI iI PMAJOR(Men 01)F- FINALSTORMATER RUNOFF BASIN OVEFLOWSTOANWATER

*. Do ISC ED .MONITORING PERIODYER LTHIDAY :1 1YEAR IMONTH IDAYFrom:IOl 9 1 0 1 2 [10 j~1 1 To:j 0 1 9 1 0 1 2 1 2 1 8 1,TY OR LOADIGRCNCETRAIONNO.FREQUENCY SAMPLEPARAMETER OF TYPEI><0U I EX ANtALYSIS TPNICKEL, TOTAL SMPLE19)(AS NI) MFEASUREMENT

_- _______01067 1 0 0 ..A 2.EFFLUENT GR_ OSS VAALUE .___ _ .__30 YAVIG ,,,Y , ... __ __ _ZINC, TOTAL (19)(AS ZN) MEASUEMEN

___) 1____)_01 9 1 0 0 '2.0 ..... :i IEFFLUENT GROSS VALUE "U : I"-" ,-, Li -' V .... " "____ -OIL AMI GREASE (A1MPL-MEASURE~M"ENT (26) 19(t)03582 1 0 0 "" .0 ,. TWMWEFFLUENTGROSSv.,

VALUE MG/ r ...GPr:.:i em ..

MFLOW, IN CONDUIT OR SAMPLETRU TREATMN.T MEASUREMEN (03) --EFFLUENT GROSS VALUE : .. "p ..A -...,.. ._ -- " T L-SAMPLEMEASUREMENT SAMPLEMEASUREMENT___r SAMILEMEASUREMENT HRN&AMME

A c1m penayE *I aw ow ft mg ril wasp R TELEPHONE

-DATEPFN~PA EEuns FFrll o'mra &V m ,lh$ al to w iull oome gawm Id Ifte ftem , SLONA O oan aq t tra* iFe Brtdley J. Adam w p 615 4m6W3j7W19 in .to Ow binto my ~mIseml wl bb, S. a~ur. ami tan SIGNATURE OF PRINCIPLE 09 03 19PM" anage i'ew~ika~~mo~m~le~e~~,kLjj ftp0Ntfy EXIECUTIVEOFFlICER OR NFJ YA OTTnm_ _ _ _ _ _ _ a" i AUTHORIZED AGENT __coUmmi AN OF Av viOAS (Ruem a.n-..mmntm two)EPA Form 3320-1 (FS O 9D PAGE-F 210S ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 February 2009BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)02/07/0902/14/0902/21/0902/28/0912012012012074.360.569.064.1Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalcukated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of February 2009.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byr-cn~yfrdb~clcrk\MosthlyDMR~attacIfeWO9 ATTACHMENT TO 0COOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit UL0048313 February 2009COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 28 of 28 days.k:byr-sbymd&\cddyDMo~nhyDRattWh~lfcbO9 EXELONBYRON STATIONPermit 110048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes) 02/02/09 20 2002/03/09 20 2002104109 20 2002M05/09 20 2002/O06f9 19 1802107/09 18 1902108109 18 15HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 02/02/09Time: 11:58Analyzed by: M.P.Reviewed by: D.M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.04.0.020.00I IT0255075MlnutW100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION 02109/09(Minutes) 20 I 2002/10/09 20 2102/11/09 17 1802/12/09 17 1702/13/09 20 2002/14/09 20 2002/15/09 20 20HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 02/09/09Time: 10:27Analyzed by: D.C.A.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.00.500.480.460.440.420,400.380.360.340.320.300.280.2610.240.220.200.180.160.140.120.100.080.060.040.020.00T i Iit I I 1J i l l00255075Minutes10012515 EXELONBYRON STATIONPermit H.0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes)

U-1 U-202/16109 20 2002/17/09 16 2002/18/09 20 2002/19/09 20 2002120(09 20 2002/21/09 19 1802/22/09 20 19HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 02/16/09 Analyzed by: M.P. Unit: ITime: 11:40 Reviewed by: D.M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only..46-1.44 25 I 'I81400 75 125Minutes EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION D2= Dosing Time(Minutes)

U-! U-2L02/23/09 25 2502/24/09 25 2502/25/09 28 2702/26109 27 2502/27/09 25 23[02/28/09 1 25 1 23HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 02/23/09Time: 12:40Analyzed by: D.C.A.Reviewed by: D.M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.SI0 25 50 75 100 125Mlnutn150

.g Exelton..

£xelon Geýnerj,,on Co....pany, Ir- %wwxxe~oncowrpcm 1Byron Station4450 Notth German Church RoadByron, IL 61010-9794 April 20,2009LTR: BYRON 2009-0050 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit Number110048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units I and 2. This report covers the period of March 1, 2009 through March 31,O2009.Hf there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley J. AdamsPlant ManagerByron Nuclear Generating StationBJAIZCtsdk Attachments NATIONAL POLLUTANT DkSC#4ARGE ELIMINATION SYSTEM (NPOES)000MRIME MO REPORT (WUR)PEMIT`TTEE NAM&ADORESS NAME Exaon Geneaion Co. LLCADDRESS 4300 WTidI RoadWaninvle, IL00656FACILITY Byron Nuclear Poww StonLOCATION 44,0 NoM Genn Cur RoedByrn. IL 610101L0048313 PEMI NUBEA01 0MONITORING PERIO[YE MONTH I DAY I YEAR DONTH DAYFrom 0 I 1013 0 1 ITo: I 1 1 013 3 1 1 1MAJOII(IUM01)F -FINDMERIA~MR uaOs~MER (OCIIA)EFFLUENT0.. tdo 06mvite ..I I l I

I !NOTE: RPad ni mbu ns heorpetmw Ot fomQUANTITY OR LOADING QUANTITY OR CONCENTRATION N.FEUNYSAMPLE SAVERAGE MAXIMUM UNITS MIM AVERAGE MAXIMUM UNITS SOLIDS. TOTAL SAMPLESUSPENDED

-- () 0.7 0.7 (1M) 0 266RMN, I i fl I W , ý:+. ..1 .1 %I ll .:: ..,s .15 A0"63 100 -311a MOIL OPCEI-EFFLUENT GROSS VALUE : lBLO -W_______

-YA-VG- DA~IYWAK MOTCHROMWiK HEXAVALENT SAMPLE(19.

(AS CR) MEASURMBENT

--(2) -) 50001032 1 0 0 -.. S

0,1 02 _EFFLUENT GROSS VALUE -- LB__)Y ___ 30DM i DM.YMAM ______._CHROMIUM, TOTAL SAMPLE -19) 500(AS CR) MEASUREMENT 01034 10 0 __M ~ -A::. 2BD -IL0UYEFFLUENT GROSS VALUE , ,"_"__""_BD.

--A-(A TSAMPLE -(26) (19) 5o001042 10 0 PERMITc-MGOIL OEFFL.UENT G SV U. m___ ___ __. ' ___... D AILY 611.FIC TOTAL SAMPLE (19) 50(AS FE) MEAUREME,

---01 1 0 0 0 .1 , * *. .""EFFLUENT GROSS VALUE ............

W .10) 1. o o.vLEAD. TOTAL SAMPLE:(ASP)- -MA) UR(19) 50001051 1 0 0 PER .EGS'DY --...2 04EFFLUENT GROSS VALUE J1inS :T ______ __1___oA DAIYPM DA-I-Y-NKEL TOTAL SAMLE (19) 50(AS NO MEASUREMENT

---__01067 1 00 LSY -O20 .O. AEFFLUENT GROSSVALUE

-30YA MW ____(A-N)- 1w. -----+8 -No u

uWL atla s m d o p -umd --h -W ag I~u Wt a v T E L E P H O N E D A T EPFIIAL EXECUTIVE or o &4w mIcn in e ssywn m mm mrpm mgwan imemmlmWnii Bowanntftd V s1Pmmor 5wwm 615 406"700Bradley J. Adamrn smiom I arimoi p d" lN o th n a 09 04 2n aNrdI. l ef bond namg p lm SONATORE OF PRINCIPLE Plant1Monegw ft, a n p SWbmabIa f a v t 910Mwp d EXECUMTE OFFICER OR A NUMER YEAR MONTH DAY' lw 10 MpUNNwu vlimmomw AUTHORIZED AGENT ........camkWM MOI EPLAAI1ONm OF ANY VIOLATIONS (Rallarere al afttegimmistem h).There a no duege at mPocesee uImem chdmn deam" waft aW er a~ng IS monfn.I Fiow r sdW 27 o 31 days *NbV o mof-aEPA Form 3320-1 (Rev 31196) 8DPWI IOF0a NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)-c N, o- W -N REPOwR M"PERMITEE NAEFADORESS NAME Eelon Generation Co. LLCADDRESS 4300 Wnfl RoedWamwmile.

6L665FACILITY Byro Nuclear Power StationLOCATION 440 Germn Chuch RoadBymn. IL 1010PEMI NO43EISI AMI 0I DISCH4ARGE NUMBERMOI"TORVNG PEOD,YEAR IMONT I DAY A I Y IMONTH'I DAYMMJOR(6U3R0lF- F6ALDEMWERALIE REGENERATE (001A)*..W N UCl4ARGE

..From 1 0 I 9 1 0 I 3 I 0I I I To:10 1 1 F0[13 1 3 1 1 1...... l_________________NOTE ReaMW M.*' ewwvm f? ormQUANT IT'Y OR LOADING QUANTITY OR CONCENTRATION NO.FUENCY SAMPLEPAEXTE OF TPAVERAGE MAXIMUM UNITS MINIUM AVERAGE MAXIMUM UNITS ANALYSISZINC. TOTAL SAMPLE -2) -So(AS ZN) EASUREMENT EFFLUENT GROS VALUE 01I1r __.__,___

-:UDAYAW OYWMAX MG&.__NLY FLOW. IN CONDUIT OR SAMPLETHRU TREATMNT PLANT MEASUREMENT 0.012 0.091 (0) --- 0 136 CH66060 1 0 0 PEW ~fJTEWJ -CEY NEFFLUENT GROSS VALUE .R..35DRYA ll w .,, ....-.-. -SAMPLEMEASURSMENT MEASUREM___

&AMPLEMEASUREMENT

_ _ ____-I:.. ___ .. _SAA4PLEMEASUREMENT

_ "rNTSAMPLEMEASUP W _ ___--"- ..- --*4ALWIflUE

"" ifi t uW6UfU-PWLINK*

my TELEHON DAT* .... ..,, ,PRINWIAL E)M:UTnE OFFIGE M~ or I4mo In amomft" a/m m la dwmt O ma Wwwfe g W ~ r W d w " t ko n e s v n .B O W an /n qW M f o I , o r p w 8 1 5 4 0 06 -3 7 0 0glad"t J. Adarms mffiftý a t dm"y 0,re 1, m 09 04 21)aunb TAm. IoflW my 6W b w. maW.f tcamyiue.

In= SIGNATLS OF PRINCIPLE Plan! &hngs Ord lure Me'91 posmae ImhuigAWWW",

Il pofy EXECUTIVE OFFICER OR zzER O~WWa A NUMBER YEAR MONTH AAYCOWMUITS AND EXP.MA1IMO OF ANY VIOLATIONS (P um al lu. hre)IEPA Fon 3321 (Rev 3199) so PAGE 2 OF2 NATIONAL POLLUTANT DISCHARGE ELIMNATION SYSTEM (NPDES)DOSca4MA MONWORINO REPORT (PM)PERMrrrEE NAME/ADORESS NAME Exelon Genemrion Co., LL.CADORESS 4300 Wkind RoadWanenvus, i 6068FACILITY Byron Nuclear Powhr StationLOCATION 4450 Nor Gemman Ch RoadByron. -- 610101L004M31I B01 0I am 0Imm.M OM IIMNG PERIODI YEAR IMOWNTH DAY _j IYEAR IMOW"T I DAYOcuuMNAOM(BUM 01l)F- RIIASTP EFFLUENT (FORMER 0018)EFFUB"..elNO OSONAROE E .Froml 0 I 110131011I Tb:I 0 1 9 I 0 1 3 1 3 1 1 I.....I IIl * .....I0 00NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)-UNME MuoWoRM RWR (oR)PERITTEE NAMEIADDRESS NAME Eaon Generaton Co., LLCADDRESS 4300 Wnflgd RoadWanrenvil.

L 60565FACILITY Byro Nudear Pam StationLOCATION 4460 Norh German Curch RoeadByron, IL 61010IL000531I PERMIT -UODISCHARGE NUMBER*UAM(SUBM O1)F -FINALWWI (FORER 001C)E.l. NO0 DISCHARGE

..[ MONITORING PERIOD II ,YEAR IMO:NH D IDAY YEAR MO DAY IFroml 0 1 9 1 0 13 101 I TO:1 0 1 9 1 0 1 3 311__ _ _ _ N OTE! Read &A )eforn -tfrNOTOFQUANTITY ORLODNGOIATY O ONETRTON NO. FROEC SAMPLEPAMETEAVERAGE MAXIMUM UNITS MINMU AVERAGE MAXIMUM UT OI TYPEu m AV UNITS ex ANALY'SIS SOLIDS. TOTAL SAMLE-- -SUSPENDED MSURMENT

--(26) -c1.2 3.4 (19) 0 240 OC00m 1 000 0 r 5.0 SI ..m 3EFFLUENT GROSS VALUE -E 101 ,.. A3A DVY MAX WEEKLY DIMACHROMI. HEXAVALENT SAMPLEII (II i (..r(AS CR) MEASUREMENT

__(2_) _ _(__) 5O001032 1 0 0.0.1 02EFFLUENT GROSS VALUE --,T -- .- _IAY_ DA..Y S MCHROMIUM.

TOTAL SAMLE (1) 50(AS CR) MEASUREMENT

---01034 1 0 0 IA. 2,.EFFLUENT GROSS VALUE -AUI1WVG .Yl1ILV iGI -ADZ.GYCOPPERT(19) 500(AS CU) MEASUREMENT (20) ______0102 10 PEIo 0.51.-EFFLUENT GROSS ---LBSIOY 3 DAY AVG.LYmw MOI DAILY GRAB.IRON.TTAL SAMPLE -(2")(ASFE) MEASUREMENT

-) -)01055 1 o o smo ".0 .0EFFLUENT GROSS VALUE RECIENSW

& : ....LEAD. TOTAL SAMPLE -,) 19) 500(ASPS) MEASUREMENT

____ _()__01051 1 00 PERMIT LWY02 0,4 AEFFLUENT GROSS VALUE MinIT -,YDAY AVG " DAU.Y wx. DAILYNI:CL. TOTAL SALMPLE(AS NI MEASUREMENT

( 5 jo1o4*7 1 0 0 PEMIr I~ ,.m .,. ,.v EUNT'GROSS VALUE I -________

UDNV AVGf MM. ...'MAEaTTE

mw1 pnlw d o w u oit Wo amolM Him 9 IN under mi TELEPHONE DATEPFIRIWCAL EXECUTIVE OFFKX A me or super d ,m et ome inn Wpwm nnei~eomppe &V @v4A ft dom wmbhs @LrA aw an nV ud ft101 pmm r uuV4Bradley J. Adarris -63 n f $P m O am d y tesom 1 hlimta VU b43mmbt .Us m ........radl Adamsa b ed .to U. b d ny e ao s1 , me. b c'at. tww 1 611 Ism SIGNAT OF PRINCIPLE Plaftm r m5mmoew wrtwt ,v f EXECUTIVE OFFICER OR .AREATWEDOR fwmvw AUTHORIZED AGENT DAYECOIBIEh AMD UPLANA1IO OF ANY VIOLATIONS (Rherenme MR m tcuesewo)

1. There Ye noadwpa el pocessed sea nor a oawar doorng 111 onfm.2. Row tis ouia120 eol31 days duar ghe mor.EPA Ponn 332D-1 (Rev 3199 SO _PAGEl OF 2 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)OmcARnE MOWO -Wo MR)PERMITEE NAMEIADORESS NAME ENmOW GaineratbW Co., LLCADDRESS 4W0 W~iil RoadWa~vnvhil.

L 00555I NO0401I PEMTNMEI c"t aoI O~CKAWGNLAO MOA"(31J3R01)

F -FINALWWITP (FORMAER OMICQ*a. N10OWM~IARGE EMONITORING PERIODE I YEA I N DT IhDAY YEAR I'MONTH I DAYFACILflYLOCATION4460 Nod GemnM Ohuch RoadByma~ IL 610100 1 9 I 0 I3 10 11 To1 r0- 9 0 13l 1 31__ __ __ _TE: Read k )atdn no Moth lof aPARAMrETERY OR LOADING QUANTITY OR CONCENTRATION NO. EOENCY SAMPLEAVERAGE MUA M UNTS MINIMLM AVERAGE MAXIMUM UNTS E OF TYPE___ __ __ __ __ UNITS_______

_ _ __ _ ANALYSISZINC. TOTAL SAMPLE-.(AS ZN) MEASUREMNT

-26) -.(19) 001002 10 0 uRpmEFFLUENT GROSS VALUE f~hT --o LSSIDY -Y MG&t DALYMEASURIMENT (20) 12.3 2.9 (19) 0 240 oR03.2 1.. 0 .... .... ". ... ....EFFLUENT GROSS VALUE AWlWW~f'

-0AA1 -A& MIiD AX: V _FLOW. IN CONOUW OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.2 0.043 103) ---- 0 135 TMV0050 1 0 0 .. ;-.EFFLUENT GROSS VALUE RFIEn418081T OY MD-O. TOTALM.SAMPLEMEASUREME_

SAMPLEMEASUREMENT__

SAMPLEMEASUREMENT

_E/ U ... .. ..~ .. .....~ ......SAMPLENAMENITLE PRINCIPAL EXET1VE OFFICER ~ aws, aa I* eIVA to TELEHON DATEpmu ________Stmr J. Amm. WnW mN to afd. SOO m RN V mt pmm or p[wm -140&3700vA~b~s. to f bes d fly ag&Viop vu sO a m I awvo' 09~r~o 04{20Pthatagf S uem QB an.1wbdt iaktafwa alQ~ EXE~ CUTIVE OFFICER ORNWERYA MOhTvvDO ,mtm Na wNd 0siS fo kwvvb AUTHORIZED AGIENT ________

YEAR MONTDAAAOMNY VIOLATIONS (PAswwa hmmEPA FotM 3320-1 (Rev 3199 S 8D ~~2F2i NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DICHARGE MONITORING REPORT (DUr)PERITTEE NAME/ADDRESS NAIM Eimnon Generation Co., LLADDRESS 4M00 W Pd RoadWarrewie, IL60L 6FACILUTY ymon Muxear Poww Sm onLOGATON 4450 NoM Gtmn Chumh RoBy=o. L 61010IL004631EWT wUMD01 0DSHRENMBE MAAR(SUDA 01)F- FWALRADWASIIE TREATMENT (FOAMER WCID)... NO DOWcARGEI MO PEFDO)YEAR I MONTH0 I DAY _j I YEAR :MONTh DAY IFrom 1 0 I 910131o01ITo:I 0 1 0 1 01 3 3 3 11I i I ---i II NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)ONMcHNGE MOWrORUoG R0oM (WMM)PERImITTEE NAME/ADORESS NAME Fion Gonerflon Co., LLCADDRESS 4300 wflsld RoadWamwhils.

L L6056FACILITY By=n Nucder Pour StationLOCATION 4460 NOM Geman Chuch AoWdByron, L 61010I L0048313I PEMTNUhER I Eol oI Dl~~AAOS NUBEMOe:oI NG PERIODFrmm 1 0 101 0 13 10 111 lTOA 0 1910 13 13 11 1MAOR(SUOS 01)F- PHALSrO~mAIER (FORMER 001E)STOMWATER

... NO DISCHARGE E ...l l I I " " "PARAMETER QUANTITY OR LOADINGAVERAGEUNITSPH SAMPLEMEASUREMENT

--00400 1 00 PT "EFFLUENT GROSS VALUE REM1I0 ": ..-SOLDS TOTAL SAMPLESUSPENDED MEASUREMENT_

00130 1 0 0 ~ ~ D~'EFFLUENT GROSS VALUE _______ _______CHROMIUM,

'EXAVAJENT SAMPLE (26)(ASCFON MSAE U-EMENTEFFLUENT GROSS VALUE

,

ow:: B f)tCHROIUM, TOTIALASCR)01034 1 0 0EFFLUENT GRS VALUEEAMPLENMEASUREMENT w9* I(26)I.SEDYCOPPER, TOTAL SAMPLE(AS OU) MEASUREMENT 01042 1 0 0 --EFFLUENT GROSS VALUE ____ :__ .. .:... : ..; -IRON, TOTAL SAMPLE -20)(AS FE) MEASUREMENT_

_ __ _ _01046 1 00 T-EFFLUIENT GROSS VALUE .10_________

LEAD, TOTAL SAMPLE(AS PS) MEASUREMENT

-(26)010511 0 0 0 EFFLUENT GROSS VALUE ~-- LSDPAINCIAL EXECUTIVE OWNICEBrafsyJ.

AManiaw agned or acrdonbmus uwh a spmgn fsiu o man 00 od n ammps-Ilgomwoevotom~

ft ded wasc 4b1*bd& Bsued an ay Vswfd ft am or peawkftmW mabnfd iL to the be o ray wmbadswndbo.

Outbd .bamf IandS 1, pm I31m SIGNATUVEOF PRINCIPLE emomete'N'

--~u Iftat. ydblItwe*Itafthw~

f$ I-lpo EXECUTIVE OFFiCERCOR 7wa'ftdskpiovn~mlw trwi ~vkilb AUTHORIZED AGENTIWW m KNOWCOUE1111NTS AND E(PLAmArO OF AY vWLAISoN (ftommena an --amst hare)"1. No Twb~w buidhi wasloalatr was dischaged to ft Sboias mm offun Basin durtn blie montEPA Form 332D-1 (Rav 3AM 8DP99IOF2 0

NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)msMGE -OmN REPORT (UR)PEWTTlEE NMJDRSNA&W Emio Gowalion Co.. LLCADOREBS 4=0 WbWfad RoadWarrenyhils IL 8066FACILITY By=ro Nudea~r Power SaswoLOCATION 4460 NnM Qannan Chumh RoadBtnn IL 6101011.004M31 wEA NUBEE(" 0DISICKARGE NUMBER0c0mw.MAOR(SueROI1)

F -FUIALUTORMWATEP (FORER O01E)STORWATER

-&*NO OINCHARGE I IMONITORIG PERIOD II YEAR IMONTHI DAY f YEAR MO DTH IFcm:I. 0 1 9 1 0 1 3 1o0 1 :1 o 0 9 0 1 3 1311 II NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DOCHARGE MOWTOROM WVOR (DR)PERMITTEE NAMEIADDRESS NAME Eomdon Getrwaion CL. LLCADDRESS 4300 WhWTud RoadWaffnvlts, IL 6665FACILITY Brmn Nlear Pow StakonLOCATION 4460 Nor German ChUCh ron. IL 61010IL0040313 PEMI NUBE0M1 0DISCHARGE NUBEOCRO601(suen 01)F -FINALCOOLNG SYSTEM SLOWDOWN* NO OISCHtARE r.,,MONITORIG PERIODYEAR MONTH DAY YEAMo-I Oh DAYFwm 01 0 13 0 1 To:1 0 19 10 13 131PARAMETER QUANTITY OR LOADLNGAVERAGEUNITSPH SAMPLE ....MEASUREMENT

_ _D 10400 100 m I.-EFFLUENT GROSS VALUE ______ __________

DOPPER, TOTAL01042 1 0 0EFFLUENT GROSS VALUEESUAMEMEASUREMENT (3)I.SIDYpewC -C I. 4-ZINC, TOTAL(AS ZN)01O02 1 0 0EFFLUENT GROSS VALUESASUREEMEASUREMENT (3I)LBSI)Y.......... .....-OXIDANTS, TOTALRESIYUAL34044 1 0 0cIwl I wtzM fllIWI@ M1 I1ICSAMPLEMEASURIBANT (2)LoSamYFLOW. IN CONDUIT OR SAMWLETKRU TREATME.NT PLANT MEASUREMEFNT 19.77 25.40 (03)50050 1 00 exi,, I, 'T _EFFLUENT GROSS VALUE 0 D&VAyO ~ -CHLORINE, TOTAL SAME (3)RESIDUAL MEASUREMENT

_ _()50060 1 0 0 -" SIEFFLUENT GROOSS VALUE inin _ .."... .HYDRAZIN5AhwEMEM46URWMN 81313 1 0 0EFFLUENT GROSS VALUE(38)(U26YP-wv-if I ~___________________________________________

-______________________

-________________________

I -* -BrcIaft J.un Aft=eloigrw*--r

-u POA aki *26u doaomwlwold a wkestwas

.uld wi "v.sdmt ~ ~ ~ wft meb 1i 1~s ie'mdied usnew~eafd guw'vcps'v ~ ~ 1 as, FAld Boma me hmwkm of"~d 6us or MvpIwwmig ot mmwfte soUm Urn..t of w s*fpes1wme I a*N ooww" .sam. tobdatlewt

, sbU 0 to bW~ ort "V Ww I hl w~ d WK b. S.uam.a sM r~d I wn-dd umus qico pe~ m sbr ku ionflt.koift" wa dla idft IiiuUgoICcuu1m AND EXPLANATMO OF ANY VIOLATIONS (Awderm vis 'l AJu 'int imes)Per agueWl Ooniý 4C., the ffa~ujm alwmitble Movown lart~m~rae ciab~tko resuls wre Wa~fed an the aftdchwtt 8ffATTACHED

[EPA Fom 332D-1 (Rev 39) 8D PAGEJ OF I 00NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)mDSCHARGE uMOwTORu REPORT (M)OOCROMPERMIIInE NAME/ADORESS NAME Emion Ganemnan Co., LLCADORESS 4300 RoadWaawelis.

Ln606FACILITY Syw Nucloer Por SlatonLOCATION 440 Nloi Gemaen Chuolh RolWpon, L 610101L00411313 PEMI NUMER0020I I DISCHRGE NUBEMOIMTORIG PERIOD[YEAR MOWNI DAY I YEAR MONT DAYFrom: 01910 131011 101 9 o01313 11KMMOI (SUBR 01)F- INALSTORNWATER RUNOFF SABSN OVERFLOWI TCWATER... IMO SCHARGENOTE: Flow_ _ __ _WnoTE Res tOn "QUANTITY OR LOADING QUANTITY OR CONCENTRATION NO FREQUENCY PARAMETER I_____ _____ OAMPLEAVERAGE MAXIMUM UNITS MIA AVERAGE MAXK" UNITS ANALYSISPHh I~wLE (12)MEASUREMENT

---_00400 1 00 7 r o -Em aEFFLUENT GROSS VALU "RIMINE W -_____ ____ M1111111AW

&WNW4 -U _______SOLISD. TOTAL SA'L2SUENDED MEASUREMENT

() (19)00w 1 0 0 -O- LOW~Y -" M&WEFFLUENT GROSS VALUE ,,0 T1 ,___ "_" _ '____LY_

3POW LYIM, UGh ,..........

V3&WVO c ayMACHROMIUM.

HEXAVALENT SAMILE (20) -(IS)(AS CR) MEASUREMENT 0103 1 00 --061 0.2 iEFFLUENT GROSS VALUE ' ___,__,_,,_,,,,,-_,,

_,_........

= ... ..... r MAX,_,_......

TOTAL S UML A 19)(ASCR) MEASUREMENT (2)0104 10 0 FEM? Lomy E F F L U E N T G R O S S V A L U E A W I- W- .. ..... D AI.- ..PCOPPER TOTAL SAMPLE(AS CU) MEASUREMENT

-- (2)-1501042 1 00 : T --L.BhDY -t"o i. -AEFFLUENT GOS VALUE .3W _

__________e UION, TOTAL SAMPLE(AS FE) MEASUREMENT

-fg)01046 1 00 .MI: .1.0 1* __EFFLUENT GROSS VALUE ..C A- -LNhDf -s1 WKY kw MO'- ILLY(ASPs) M.AJUREMENT

_ (25) --(-)01051100

1. -0Loam 02,..EFFLUENT GROSS VALUE 30 DAY00 ________

A-,cefflyundervenft d lo et amew wa. ~uwe wn p, , m:. T TELEPHONE DATEP0C4PM. EXEcUTIVE OFRCER Gr *WM -11 ' M 1 .9 tI __M____M_

_ I I___Waft J. AM= o o15 4-4g"M00 I0 04 20F an sd ik lo ft bw ofaw c wd bs 9w acgs wW owiiim. I on SIGNATURE OF PR94NCPLE

___Plant Manar Wfwswe omiW 1w tifterll, ad- xk@nlmdla EXECUTIVE OFFICER ORA NUMER YEAR MONTH DAYo U me UaU 1 VhO zM. AUTHORIZED AGENT YER MNT_ ACOMMENTS AND EPLANATIO11 OF ANY VIOLATIONS

(~rehmis SO sbadmftm her)1. No Tw"re bul*V wa was dldWg to fe Runaoff Basi n & e monli.2. This dbechs poft wa not used If m"On.EPA Form 3320-1 (Rev M"9so PAGE I OF NATIONAL POLLUTANT DISC8ARGE EULNATION SYSTEM (NPDES)DSOHARGE MOrTORNG REPOR (DMR)PWTTEE NAME/ADDRESS NAME Eulon Generation Co.. LJCADDRESS 4300 Wmfle RoadWanmmiwi, a 6088811L0048313 0020OCIS~ARGENUM IIUMAOR(S1UM 01)F -PEALSTCNWATER RUNOP BABE OVWLOWMSTORWA1US.. No ScHARimEXD

.IMCORING PERFOOFACILITY Byrn Mcear Pom StWon I YEAR I MOWNh I DAY I I YEAR I MONTH I DAY ILOCATrON 446 Nort PRad From,1 0 1 9 1 0 1 3 1 0 1 1 1 To: 0 1 9 0 0 1 3 1 3 1 1Byro, IL 61010II ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit IL0048313 March 2009BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)03/07/0903/14/0903/21/0903/28/0912012012012070.767.575.065.1Note: Station procedures derive the Calculated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of March 2009.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak:byr-chMryyondbkclerMonddyDMRanuMiUnuM ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit IL0048313 March 2009COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.k:byr-chyroodiAcierkMon&IyDMRatmdvDlUnarO9 EXELONBYRON STATIONPermit [L0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes) 03/01/09 25 2503/02/09 25 25103/03/09 25 2503/04/09 25 2503/05/09 25 2503/06/09 27 2603/07/09 27 2603/08/09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorineihalogen vs. minutes of chlorination period.Date: 03/02/09 Analyzed by: G. S. Unit: ITime: 10:25 Reviewed by: D. M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than this limit are reported for information only.0.500.48-0.46 -0.44 , I0.420.40.0.38-0.36 I i K '0.280.260.240.220.20"0.18-0.160.14-0.12,0.,10-q sog ,0.08 ..0.06 I0.04 0.02-0.00-10 25 50 75 100 125 150Minutes EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes) 03/09/09 25 2503/10/09 25 2503/11/09 25 2503/12/09 25 2803/13/09 25 2503/14/09 25 2503/15/09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 03/09/09 Analyzed by: M. H. Unit: 2Time: 12:33 Reviewed by: D. M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than this limit are reported for information only.0.500.48.0.46 , ,0.40 I , , ,,,0.380.36 40.3400.320 36 .....0:30 I I0.3020.28t 0.26 ....- J02420 .2 2 -I .......ii , '0.20-0.18.0.160.140.12 !0.10-0.08 "4'0.060.04 -........0.02 "0.00 , I , ,0 25 50 75 100 125 15i4Mlnutn EXELONBYRON STATIONPermit 1L00,8313 WEEKLY HALOGEN DOSING INFORMATION (Minutes)

U- I -a03/16109 25 2503/17/09 25 2503/18/09 24 2503/19/09 25 2503/20109 25 2503/21/09 25 2703/22/09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 03/16(09 Analyzed by: J. P. Unit: ITime: 11:19 Reviewed by: D. M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.50 ...0.48-0.46-0.440.42- 10.408 -0.38 ...0.360.34-0.32-0.30 -5 750.28 -T , '..... .0.24.ii 0.20 -' =0.18 , !,-,0.16 -0.14 .0.120 100 150150.08 M-n0.06 I' r. ..0.04- :;0.02-i0 2.5 so 75 100 125 ISOMlnutm EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION 0(Minutes) 03/23/09 25 2503/24/09 25 2503/25/09 25 2503/26/09 26 25 25 2503/28109 25 2503/29/09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 03/24/09Time: 12:56Analyzed by: J. W.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00-.f --. I --Lf

I ! 1.. IA025so75Minuts100125Ll EXELONBYRON STATIONPermit [I0048313 WEEKLY HALOGEN DOSING INFORMATION E(Minutes) 10/3/0 I 25 I 2503/31/09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/hlogen vs. minutes of chlorination period.Date: 03/30/09 Analyzed by: M. D. Unit: ITime: 11:35 Reviewed by: D. M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only..0.50-0.48 -.....0.46 '0.44*0.420.400.38 -....i0.26* 30.340.3800.2160.24 7I0.2080.1800.16 :- -.... .0.14 -j lr"0.120.10 -0.08 -.- -..0.06 A0.04 , oo, , o 40.020.00 i,,0 25 50 75 100 125 150 175Mlnuts Exelkin.Exelco Gent.iat

-n Comgpany.

i.C www,,exor'ccp corn Nuclearf~yron SutionA450 North Germianr, Church RoadUyrcn., 61010-9794 May 18, 2009LTR: BYRON 2009-0058 File: 2.09.0411 1.10.0101 IllinoIs Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit NumberIL0048313, issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units 1 and 2. This report covers the period of April 1, 2009 through April 30,2009.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley J. AdamsPlant ManagerByron Nuclear Generating StationBJNZC/sdk Attachments NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)ISOCARGE UMlWTORIN REPORT (DkR,aPERIWITTEE NAME/ADDRESS NAME Emelon Giene Co., LWADDRESS 4300 WkWe RoodWarwwfe.

It. 055FACILTY BynNuclear Power SatonLOCATION 4460 Noh Gm& Churn RoadB,".n, L 61010IL00OSISPEMI NMBERAMl 0DISCHARGE NUMeERim~O(usNoll)F -FINALCEM91RALZIn ROEGEERATE (00lA)EFFLUENT0.. NO DISCHARGE tm l Il rt-.F YEAR MOM T I I YEAR MONTH DAYFrom:I oi Io 0i 4 1 5 1 T To: 1 0 o14 1 0______________NOTE:

ReadW kit~I~fore 00 isi is tamnOUANnTIY OR LOADING OLUANTITY OR CONCENTRATION E. UENCY SPAP, LMETEROFAVERAGE MAXIMUM UNITS MiNeUM AVERAGE MAXIM UNITS EX ANALYSIS TYPESOLIDS. TOTAL SAMPLE mmmSUSPENDE EASUREMENT

-2) --0.8 0.8 ( 19) 0 205 EC00"3 1" " -0 0/ "F .. "" ,, .I" 30 cuYM4X im H0om oo +emm .. +--- OW mY ,MOIL COM".EFFLUENT GROSS VALUE 01133-,01811M.

, DAY , LY.M.XHEXAVALENT SALE(AS CA) MEASUEMENT (U6) (19) 5oo01032 1 0 0 LOWY _____ 0Y1 02 GRS VALUE 3DAYA --tm" I..BSI/DY

CHROMIUM, TOTAL. SAMPLE(AS cR) MEASUREMENT (U) (19) 50001W4 1 0 0 ".1. MOIL DAL-N' V .-,.mLLBSADYlY 3IDA1A.MEFLUN GROSSALUE FMX03N ......--COME 26) -(10) 500(AS CU) MEASURM£ENT 042 1 0 0

W ".L.W Y ...-06 .. .. 1.O.EFFLUENT GROSS VALUE W LSDY-V M.DM KiRON, TOTAL SAMPLEI8 IN --- (2U) -(19) 500(AS FE) MEASUREMENT 010,16 1 0 0 ... , ...'. .. ..IoE F F L U E N T G R O S S V A L U E R- -,l q L O SW Y -lr -G M D .._ .. .LEAD, TOTAL SAMPLE (- ) 500(AS NI1) MEASUREMENT 1_)01061 1 00 MIT --.y -. 20.2 04 DALY awEFFLENT GROSS VALUE , *'- -Su.Y.tX --"rCE, OTALSMPE2..9)s (AS (NI) MEASUEMEN 0Ioa" 1 0 0 PERMIT ps~ .1..EFFILUENT GROS6V'ALUE ma m+ ,++ :": Y " + .

.+ *ll yw,,+:x" AY,M.ETmE ~ iy~iv eay ~ Ue~dani-w0m w irU -a.i prqud atdW TELEPHONE DATEPAENCIML EJW1 OIFICER Omlo, g&.' In a0wc.fa a, dpb~d to maemr MU ~ln isowe ____JowI 0 d w Mon ft Sat"b5S f mU aon yt i f to vem or pS o we x p m15 40 370 05 1sfJ. Alafw Mo spum. orrmaein m uUr mdosulwf m 0o 09 Tmnmbn b. to Sw bss m p kla. se aaw. omr. Ian SIGNATURE OF PRWIPLEPam Magger gMeMmute 1iwi puiulutms f llG 1r WU', biyam pmld EXECUTIVE RAUER YEAR MONTh DAYI tl kaamr trnmi Io Wami .AUTHORIZED AGENT ___DICOMMENTS AND EKPLMA11ON OF ANY VIOLAWINS (Rhsrmnc d -ahefi1 -hmbi)I. Them was no o processed steam gnrmo mdncal cearug waft water dinmg morlt.2. Flow eAsted 29 013D days dW" ft mo.t.EPA Form 332D.1 (Rev 3/99) SO P 2Ww NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES)DsCHARGE MONITORIN REPORT PMA)PEROIT'EE NAME/ADDRESS NAME E 'ic Gmeneukon Co.. LLCADDRESS 4300 WkMW RoadWarrenvie.

IL 60685FACILITY Byron Nudear Power StationLOCATION 4450 Nort Gemlan Churc RoadBymn. IL el010POW NUMBERIA011 0I DICKARG -U4EINMUO(BUMA 01)FFIN~Al.IMIERALIER REGENERATE (OO1A)... NO DISDIARGE PERIODY YEAR IONTH I DAY YEAR I MONTHI :DAY IFrom: 0 1 9 1 0 1 4 1 0 1 1 1 To. 1 01910 1 4 1 3 101 NATIONAL POLLUTANT DISCHARGE EULMINATION SYSTEM (NPOES)DOSCARGE MOWTORING REPORT (DWI)OCRO00oPERMITTEE NAMEIADORESS NAME Elon Generation Co.. LLCADDRESS 4300 W-fffd RoadWanuvills.

IL 6066FACIlITY Byron Nuclear Power StatioLOCATION 4450 Nor Gwemn ChOch RoadByn, IL 61010I 11004313W MINUhUERI SW 0DISCHARGE

-UIEMAJORSiP EFPLU4Tf (FORMER10 0010)... NO OWicAROEMONITORING PERIODI YEAR I MONT IDAY I I YEAR I-MONTHI DAY IFrom:l 0 I 9 I 0 I4 1 0 1 1 1 To:I 0 1 910 141310 1NOTE: Read for Ax gj~m' is tamQUANTITY OR LOADING OUANTlIT OR COCENTRATION t.FREQUENCY SMLPARAMETER

___________OF TYPLEP A-AAAVERAGE MAXIU UNITS MaIU AVERAGE MAXIMUM UI A Y TYPE(2ODEG.C)

USAM NT <0.12 <0.20 (26) C2.0 <2.0 (19) 0 290 DC00310 1 0 0 low, BS-,gas-TV "= ___.EFFULENT GROSS VALUE R 1ECINIIITr 30 DAY AVG DALY .AM LBSIDY .30,,.t .RAVG A.LyMt -. m. -PSAM sPL -729 7.56 (12) 0 290 oR00400 1 00 Gl --ESo 's. SU sIMEFFLUENT GROSS VALUE FAEOWEMEET

_____ _____IIIM.M

______ ______ MONO!SOLIDS. TOTAL SAMPLESUSPENDED MEASUNEENT 0.03 0.05 (26) 0.7 0.6 (19) 0 290 DC0631 0 0 4.2 .3"o.EFFLUENT GROSS VALUE I T .,30 DA : AVG .UXMA L.BSY ... .. 26.0 MOM IFLOW. IN CONDUIT OR SAMPLETHRU TREATMENT PLANT MEAUREENT 0.007 0.012 (03) 0 136 CN50060 1 0 0 ,PT ' -OmR. ,,. --... ... ..EFFLUENT GROSS VALUE 111M111ICU:

~3tIIIWAW DALY WE___________

SAMPLEMEASUREMENT SAMPLEMEASUREMENT SAMPLEMEASUREMENT MOO AAIEITLE om ~pw~y~~m atya a atuiumA part -n- .0-, muewedwiPANLEXEUnIVE OFCNI Um RN l TELEPHONE DATE' ~ ~ ~ ~ ~ "O ft NNClPi. or-t~v ownqF~ m *ef I fr tpnmrBradley J. Adams Io 9tU bW ayMW PU'o' crumW 615 ,06370W 09 06 1isala-ed f m W, me lem m y i m d b , uu, a wu , wa cm v, m SIGNATUM OF P0 Maaus o WAMalftoo a lomwo ftk,£ k fU-d .of EXECUTIVE OFFICEROR NU MBER YEAR MONTH DAYre oep) m~ u 1w I~nu' vldebr AUTHORIZED AGENT _ ____COMMEM AND UPLANATION OF ANY VIOLATIONS

(..imma.

-. hare) AUTHORmD A1. Flow exilseclam thisu~ ha Uta 29 01 30 days duibi the .mont.EPA Form 3326. (Rev 3199) SD PAGE i OFi Z.O4I0 3Dfd as Ald) V-Wc UwOd V3* UcW " & IU &UP OC I LIt pUWO 54 qt nop peem rw ol "ov1uow =a 0&up JON W .M &mo uuotp jAgW uom psemw p aonqp ou m eWAe L__________________(lummiismn wips. p umametl)

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WtAV OWl ... .Ce"* : , .d~k l U 3WA tO N-nd :on t' 0 (6i) r1 60' -(U) -___ ~a3dsfl9MONS ~ ivO'sorn:s UI SISAlV ;;3 -;j;m- MUM~ 3vumv3A vmwie s145 IIWOxW 3 3dW 1JO. hfO1dO 31~ AON3fltUWi NO0IM3NNOO uO DNI4WO1 K ALU.Vlnouu01"Osm" 3am sW ~:Miom om...(010MU3NNMddLMM "I~ldN -d(toutns)HmON1 0 1 I 1 0 1 6 1 0 1:0 11I o I v I 0 I 6 I o I:umiWOOg I PWo 4 maUD 09 NOU.VOOuog1S JWAOd uWoA AW"OVdAVo I1NO. I UAA o ,w INOl I U i00Ci3d ONWOMNOIfl 1 U39flN 30WHOW ISI -t.l'J.IPMU PoWuM 00evO'" "oo U9OJOU9D I -!I.ssnuomvi0 100I i£imomiiI1 ....II ....l--: kkmo MOdM ONIOJJNOK WM(s3odN) IULSAS NOLLvN'I3 3owVH:0SO i.NV'TIOd VNOIL.VN NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)ISCAE MOrTOaING REPORT (OUM)tPERMITTEE NAME/ADDRESS NAME ExmIon Generation Co.. LLCADORESS 4300 W Oin'oWarrenvile, IL 6055FACALMIY Byron INuclear Por StaionLOCATION 4450 Nor Gemnn Church RoadByron, IL 610101L0048S13 WEAN NMBRCol oDISC1AROE

-UB(S3usa 01)F* PHALWWTP (FORMER ODIC).*..NO0m8CIW4AE YEAR MONTH DAYo T YE MOW I DAYFrom~l 0 1 91 0 1 4 l 01 I TO:I 1 0 1 4 1 3 I 0I AI-a-I/nLPReNOSAL EXEGUflW OFFICERBradley J. Adanakw~ -ameI Dewy wiw .1 pufdlw GSlft ow do andu d gl W"gt Im prund mWyWO we ."ft. or ft" inwim uiagw~ dmftg Ift g I mm flt' m, -,ua 0venmue hgimu 'I~g N~ laahlbllg immhiun kid'uispvwl,

- wi. &pw-m--wim w I ovSWu0.TELEIsG 815S*NATW OF PRINCIPLE h'AND EXUNAlOW OF ANY VIOLATIONS (R ,I1S W iP I hne)

NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DSCHMARGE MOITORING REPORT (DMA)PERMITlEE NAMEIADORESS NAME Emion Ginerabn Co. LLCADDRESS 4300 Wmeleld RoadWaerwi.e, IL 00655FACILITY Byron Nuclear Power StatmnLOCATION 4450 Norlh Church Road11.0040313 PERItT NUMBERI DIOSARGE

-I .MONITORNG PERIOD IF -FINAL,RADWABIIE TREATMENT' (FORMER 00`1D)EFFILUENT'

.. NO DOCHARGEI .I. I + I I YEARAR MONTH I DAY IFromj1 0 1 9 0 1 4 To:1 0 9 0 1 4 3 0 odByron. IL 61010NOTE Read ins*rCtom before oft formQUANTITY OR LOADING UANTTY O CONCENTRATION No. SAMPLEPARAMETER.,,E FTPAVERAGE MAXIMUM UNITS iMp*MU AVERAGE MAXIMUM UNITS ANALYSIS TYPESOCUDS, TOTAL SAMPLE --m12CSUENDED MEASUREMENT

2) .5 0 19) 0 240 CP00630 1 00 150 I.n, _MEFFLUENT GROSS VALUE 3DOAVAiGT

-uoo, DW..YNAK M , ,_____ -OIL ANDREASE MASULE (26) -1.4 1.4 (19) 0 240 GR03162 1 0 0 PT 15 260EFFLUENT GROSS VALUE -,,- --MOUNBIT 'LOWY MINIO WUNIY 2a"3+ 00KVAVO DAL.YAXFLOW. N CONDUIT OR SAMPLETHRU TREATMENT PLANT MEASUREMENT 0.023 0.023 (03) 0 136 CN50050 1 0 0 1 V.EPIEFFLUENT GROSS VALUE PEO UIDA31Y 30X DAY- -AOINL CODMEASUREMENT SAMPLEMEASUREMENT SAMPLEIII IMEASUREMENT SAMPLEM EASUREMENT,_.____

PEFTPINOPAL LECUIE OF.RM or super.d in

aimii UyUanoV1 Iwgi~ TELEPHONE DATEBradley J. Adam o n.ftmWPU wmoMr p -oAi p mm a,, so 815 406-3700 09 06 s1inlm -oftto itM beoa ma AiodV p mid f, taý. un ;mnl,. I wn I O PPant M__ _ _er &KImkImn n ia .mdln bicAln mpsmbity EXECUTIVE OFFICER C AREAN ER YEAR MONTH DAYTvm0 OR pvtom ine Bd Wb -fr vwiams. AUTHORIZ]ED AGENT NUU YAOMNH A7OKUBI11 AND EUMTMAll OF AMy ViOLAt01S (IRlmlof ml stwim I hem)1. Plow eistedmh Oft oudi 4 of 30 dayp d*g Ue month.EPA Form 3320.1 (Row 3I"9) SO PAGE 1 OF I PERMITTEE NAMEJADORESS NA"f v Gereration Co., LLCADDRESS 4300 WmdleWd RoadWanwwei, IL 60655FACILITY Byron Nuclear Por StationLOCATION 4450 Nort Germen Chuc Roadmyron, L 61010NATIONAL POLLUTANT DISCHARGE EULMINATION SYSTEM (NPOES)DISCHARGE MONITORING REPORT (OIR)IL0048313 E01 0PEMI NUE D6ISCARGE NMBWEROCR061MwO(SUSR 01)F -FINALUTORMWAIER (FORER 0011)6TORMWATER

NO SeHaRmEEJ.

MONITORING PERIODYEAR IMONTHI DAY I YEAR IMOMTH DAYFrom: 19 1014 1011 To: 0 19 10 14 13 10PARAMETER roCwUrNTF OR LOADINGAVERAGEPH SAMPLEMEASUREMENT 004001 00 WEFFLUENT GROSS VALUE 81 T ---SOUDS. TOTAL SAMPLE 2U)SUSPENDED MEASUREMENT (2_)00530 1 00 " --LDSiDYEFFLUENT GROSS VALUE .,, ,___.,CHROMIUM.

HEXAVALENT SAMPLE 2_)(AS CR) MEASUREMENT (U)01032 1 0 0 PERMIT -EFFLUENT GROSS VALUE .IM_ _ _ '_".. L__OWYCHROMIUMA TOTAL SAMPLE (U)(AS CR) MEASUREMENT (2_)01034 1 0 0 PERMITEFFLUENT GROSS VALUE .-LeSIDYFOPPER. TOTAL SAMPLE(AS CU) MSUREMENT

()01042 1 0 0EFFLUENT GROSS VALUE -, -, LBSdDYIRON. TOTAL SAMPLE 2___)(AS FE) MEASUREMENT

(__101045 1 0 0 PERMIT L.BSIYEFFLUENT GROSS VALUE REI -,M""-"LEAD, TOTAL SAMPLE(AS PS) MEASUREMENT

-01051 1 0 0EFFLUENT GROSS VALUE 6 '. --- L.DSpDYPF003PAL EXEUTIVE 0FFWA~BracleyJ.

AdamsPlntManage

?NWU ORFMI ayIa t Fa.y I' l~f dwac mm- u M I~IW p IUd aN*u ra&.herft' in .w.io -a Rom udaud~msU idpaap ~ap % g" w hiW ftI tMWa@ om a&LtlW ONOd an myj twt d ft Fa Or Pero=am3 lIw~ ft s)WNI1 or Ufe 9wo a)v UMaU@ 1w ow~k1Q Ift 1n ftNa fldmba&*nad itOw. WN da rwf to bMaid beW. bve. accL.W SW I vI I I I &M------ doe ims~wl'bokiSWb akU@3poaot y1w walipW~ubu 0who IbauICO EMAND EXPLANATION OF ANY VIOLATIAONS

( -dhre ma ameC'mmt hM)1. No Turbine bulkVg wastewater was discharged to the Storfnmatr Rauoff Basin duing the month.2. Them was no iacharge of pocesed seam generator d "ei dwSt wastewater

&Igbnt me month.3. Flow e~sd flwwnhis ufal l mdi A 3m dave &du~ thin uywit/ILEPA-r 3320-1(Rev 3IU9 SD P 21qVPLV NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)DMCHARGE NOWTO'NG W (DMR)PERM NEE NAME/ADDRESS HAM Exelon Generation Co., LLCADDRESS 4300 WbiWieI RoadWarremnve.

IL 6IL55FACTY Byron Nuclear Power SlatinLOCATION 4460 Nort Goem Church Roadeyfm IL 61010I IL0048313 F E01 0DISCHARGE NLkUMERI rm,' I flImIII! IOCR~mNMUO(BUDRO0I)

F -P9dSTORIIIATER (FORMER 001E)STOMWATER

... NO 011S010ARGE

..MONITORING PERIODYEAR MONTHI DAY I I YEAR MONTH DAYFero 0 1 9 0 1 4 1 0 I I i To:l 0 I 9 I 0 I 4 I 3 I 0 II NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPOES)DOHARGE NoWFORNO REPORT P"~PERMrTTEE NAUrVADDRESS NAME Exelor Geruwnaa Co., LLCADDRESS 4300 WMild RoadWamgwls.,

IL606L6FACIlIrY Byror Nudear Power StationLOCATION 4460 North Gemrn Church RoadByron. IL 6101011L0048313 wEA NUBEOCR 0 -jDMCKAFAE NUMNA(81.1110k01)

F -FINALCOOLING0 SYS1E BLOWDOWN...7 NO DWMcARGE

...MONITORING PERIODYEA I MONTH DAY YEA I R MONTH DAI oAYFromi 0I0I0I4I0I1 lTo:l 0 1 9 1 0 14 30 I...... IUNITS(2U)LBStDYIBI(2U)LOWSdY(U6)LBS)DY(03)WMO1(2)LOW~Y____I(U)-_I_- WIDY...t ý. ' .I1100MIT GROSS' gllLPRINOPAL EXECUINVE OFFKRBradleyJ.

AdamPlant ManagerTvm WC msI 080 MO taiWN edy lawt thb doosuimW md SM ns ON rupml 1 hidwmyUscoa or AWsieu.tni h rdanestuh awpsumn ei -, I*mmuu UU 4 = simWPed OF-N lw and ewdeis " .'inrm Nafffil saw ainia kp*y d Us psuoi or pWem 4reaft immv "s ep"m or Usia Ponrs 44r , F, ft 1W ubgo N s ' am IUs* , t,*n, sfnid kk to ft badt d myk ---gomd b"h. MA. a~mxm md o'In ian ISIGNATWUR mm de W.- i~uW 51or subMS~ Ue Worider aft g~ Vol, EXECUTVE Ibs mid hr~uIF kr violowm AUHO~PRINCIPLE hiiIFWMET1~ AMD E2IPLAKATION OF ANY VIOLAllON (RstmW d Mutu otm s Wesr)rSpecial Coniton 4C., fte maxiarm allowa"I blowdowm ternperature calculation rsIn f ame pravidled on the attachment NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)-NHAG MOUTORMREOR W dR)v NAMEIEADORESS NAME ExealoGenermlon Co.. LLCADDRESS 4300 WbineM RoadWaferwme.

LFACILITY Byron Nuclear Power StmtonLOCATION 4450 Not Germn Chuch RoadByron, L 6101011L0048313 PEMI w -1 00201 DISCHARGE

-MONffONG PERIOD I[YEAR IMONTrH IDAY IYEAR IMONTH IDAYUN"(SUBM 01)F -DIALSTOREWAlUR RUNOFF SAM OVERLOW8 1 UWATER... NO ONCRARGEFrom 0 &1 9 0 4 1 0 I1 Ta 1 0 1 9 1 0 1 4 13 1 0I ....m F NATIONAL POLLUTANT DISCHARGE EUMINATION SYSTEM (NPDES)DCHARGE MONWrM WOP= (MR)OCR0 1PERMITTEE NAME/ADDRESS NAME Exaion Genwraton Co.. LLCADDRESS 4300 WVIeMM RoadWarvnvl, Ia 685I IL0046313 II II0020I ...I rlcný I -IPFIgDISMKARGE NUMBER]m 0 i liI(SUB 01)F- FINALSTOMWATER RUNOFF BASIN OVERFLOW* OWATER... NO MCSNAROE MX...IMONITORMNG PERIODBY=o, NUCfa PoWr Saiton IYEAR MONTHI DAY I YEAR lMON I DAYLOCATION 4460 orth Church Road 0 1 9 0 1 4 0 1 1 To:l 0 1 9 0 1 4 3 1 0Byron. IL 61010I-IKAA m nLPAINGIAL EXECUTIVE OCFERrM-ey J. AfamsI cawily Iw peal) dlw 00Vi do~mowdid Sol wmua pawedwalenfr IAV/emdo r s~gewvbm In , I ,~ i WM@ e t m. I gramLui gw -amkfew ksa e mnoi &r.~~dW a ~b Macat~~tltims aoe apsam 4Ifalwugft

~~ or mos" pomm fts scw owpb ogwff ft ft am~ fkftmid emitgd b, to "i bw t a Wwwy wmst a boW. Owe amma*S w4 "'e sI I I am AIUMATf OF PRINCIPLE VMSoere 111,01-i pleOJ kw bee fibeor, billmiomew pOal DEMMT1E OFFICER ORMow sl bItpmtebmw twmm~wfm

.AUTORZE AENIPlant=as -ii iii I .... ..7 MCU ISAD EXP ANAM O Of M NY M I L lO S( i ue UIIMNW Fburotd g) 0 ..PATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit 1L0048313 April 2009BLOWDOWN TEMPERATURE MONITORING:

Date04/04/0904/11/0904/20/0904/25/09Calculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)12012012012073.372.573.287.3Note: Station procedures derive the Cakulated Maximum Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit, theCalculated Maximum Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of April 2009.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak~byrschuiTdbkcicerkW.Montb[YDMR~auacWIl\ApO9

.RATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit RL0048313 April 2009COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 30 of 30 days.0k:byr-c~brodbkloa\MothyDMRWWWm*IAVuV9

.EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes)

_Minutes.

VU- I -2 U-I U-IL04/01/09 25 25 04108109 25 2504/02/09 25 25 04/09/09 25 2504/03/09 27 25 04/10/09 25 2504/04/09 25 25 04/11/09 25 2504/05/09 25 25 04/12/09 25 2504106/09 25 2504/07/09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorinedhalogen vs. minutes of chlorination period.Date: 04/06(09 Analyzed by: J.P. Unit: 2Time: 10:19 Reviewed by: D.M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500 .4 8 , 1., ,0.460.42.0.34 I0.32.0.30 I0.283EO.260.240.200.10.10.1940.0e0.06-0.04.0.000 25 so 75 100 125 150Mbnutes EXELONBYRON STATIONPermit EL0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes)

U-1! U-104/13/09 30 3004/14/09 30 3004/15/09 30 3004/16109 31 3004/17/09 30 3004/18V09 30 3104/19/09 30 30HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 04/13/09Time: 11:00Analyzed by: G. S.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.480.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00-- -- .------- -----------.--.-

-F-- --i -I0255075Mlnut.100125V

--EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes) 04/20/09 30 3004/21/09 30 3004/22/09 30 3504/23/09 30 3004/24/09 30 3004/25/09 30 3004/26/09 30 30HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 04/20/09Time: 10:40Analyzed by: M. H.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00--II!1------t -I ---KII~ z~z: zz~zz!03255075Minutes100125 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATIONDosing Time(Minutes) 04/27/09 33 3304/28/09 31 3104/29/09 30 3004/30/09 30 30HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 04/27/09 Analyzed by: D.C.A. Unit: ITime: 11:20 Reviewed by: D. M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only..46 I I "40 I* !. 'V r......020.0.124 /-:0.42 ... P,, i0.02 -, ..0 25 50 75 100 125 1506Minutes Exelkn.Exelon Generation

Company, LIC wwwexe'oncorp.,om, NuclearByron Station4450 North German Church RoadByron, IL 61010-9794 June 19, 2009LTR: BYRON 2009-0065 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276 Subject Byron Station Monthly Discharge Monitoring ReportIn accordance with National Pollutant Discharge Elimination System (NPDES) Permit NumberIL0048313, Issued September 8, 2000, we are submitting the Discharge Monitoring Report forByron Station, Units 1 and 2. This report covers the period of May 1, 2009 through May 31,2009.If there are any questions regarding this report, please contact Mr. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Bradley J. AdamsPlant ManagerByron Nuclear Generating StationBJA/ZC/sdk Attachments

1 SUNATIONA P0UWTANT DISOIIARGE ELbUNA1ON SYSTEM "'IDES)maHNUaNRnommw0pu"

-ELE NAWARSSNANE Ejmon Osnmialln Cos. LLOADDOU 4305 Wkd IloadWanwwb. It. 006FACILITY Swan Iadme POM SWlonLOCATION 4450 Not Germa Chuc Poad%mn L 61010o-3 I1DcH~Ain 0IER(mel)F- NaLtDIIIIISMLM 1116011ATE

(=~A)"11WN00AR HI WakmwUUw"Fnw FEVURJwYEAR MONT DAY I YEAR MONTHI DAYFrom 1 0 1 910 1 510 1 11 TaI 0 1 1 01 6 3 11Ii l i n --=

0q% aNATIONAL POLLUTANT DUNCHARGE EIMINATMO SYSTEM (NPDES)DNMXUM W pu OWI(DIEzulo GensIlon Co.. LLWWmrnvft, L SOW6ILOSM3lIAM 0F- UL001IALM I ROENSWI(USA)

MD~ffOF4 PERODV EAR I MWM iI DAY I I VEAR I~~IDAYI44MOM WsWGM~ OU* RoAWFmmd 0 191 0 101 0O tI I Tal. 0 1

1 0 1 51 3- -1 TI0

10 UOII*ARMM

.RAW ka mom olomQUANnTY OR LOADWO QUARnTYOROONCENFRAYM No. FREQUENCY

&AMPLEVAETER AVERAGE MAXIMUM UNff8 MMMUM I =VWtAGE MAMMUM MRS EX OF TVIPEANALVSISSAMPLELmMulommunaff (28) 19) 61W0 0ROSS VALUE'MET PLANT0 0ROSVALUE0,014 0.000 ('0)I I-I -I-0 13 C>]-I I UMT I "WmI -AI---II IIII I I I I NATMI POLLUTAJ r D0SCHARGE ELMINATION SYSTEM (NPDES)oNmu0m m -oýR wOm -omtdon AGmnmo Co.. LWanuwib, L 66mmNun dw Pvmr $MSon160 HMa Gonmi Ouwi Roadumm L 61010uLasuatIm1 0mN*AWOM-Ii pF- MufNO* gommcuinWAR IMONTH DAY WR MOT DAYFewm I a 1 I 0 1 5 1 0 I II op 0l 9 1 0 1 5 1 3 1 1&MAKEQANIIIY OR LOADINI9-.-00)SS VALLEQ UA HTM1Y O R CO N CEN T RI MI K N O .FF K A C A L-.0 < 2.0 (l9 0 110 DC)SVALLEDIT PLMA klA1.1RAN 0uwDY MW&0.012 (03)-I-I -I -IoI136 1 HIlI WEW-ýWA III III IIIII EmII IIIII I IIII .-.-.---

iIIIII I IIItv4* slad muo3 mIftod 30 d 31 dsea *AV Su momt 0SE~w Glowdm C06 uWWaiwsvs LOWN&pMl L. 6101NA11OAL POULfr*4T 000ARGE JWAIMIONSYSWM "MM)LOSIIS I a 0'tEa DAm Y T I WAR DAYFu: 0 1 0 5 0 1 Tal 0191015121

- .NO NMý ED eon0O0so0*0sa0oT -( -Il -( mNT -( mNitWI(15)MSLm(tI s III n IIMOLI -I) 0NTII -INT111(20 1 1 (1%MOLI s II-I1 0 pmoiwmbIMVA F URPIL MAU~OcmMOLI go II*0 OWLA1NAMO WMWfVIAMW OWMM N mhwooi-ino I " dpocommoominm Womv. 0.~i m- ~ .~ 'fwfvWmt fmwbwedifeif

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L~SGFACSJTY Bpm~ tk.fw Pinr 8-aLWCATO 4450 NOM OwMM hch PoAWOPM L 61010LOS4U13I ....LOSGm~ IocrAmF- NWGrMMAIu (T0 6S10 0 NO DIBiCHAFMEn 2[YEAR Mo I l1DAY YEAR MI M I DAY0 190 105 01 ]~l ITat 0 1010 1 SI1 31 1 NATiONA PO.LLUTANT DISCHARGE BJMA*TION SYSTEM (WPM)mNCHAMWX#Omým wPORTPE~fW A/ADUNAME Eziwo Owwradon 006. 11ADDF*M 4= Wh RoodWanuwis.

L4066SLoom$,Ion 0rn-rn-O(IVSEN)WOW li *I O" Ru PcOD I WRmaFACuLTY Sftm Widw Po, UWon I EAW MWNT DAY :1 1WEAR MONTH DAY_LOCATION 4450NoIOM nenin ChwurumdPA Fmw 1 0 10 0 1 0 1 1 TO: 10 1S 0 15 3 1 1 "*0NO D9ILNAmESYMN. L 61010 NATIONA POLUJTANT DISCHRGE BJUNNATION SYSTEM (NPOES)mONXA MuNITPAN wU I OWffTTE WA DMS4AE Eimoln Owwsaon Co.. LLWACM 4300 Whb PoANWenwmUs L 4060FACU.IIY lip tbjda Paw3m 0LOGATION 4-6 Noal QnmM Ch~ RoadfwN.UL 61010I LOaslaIr-__IImOm ............

, , -7lI m...,-.IIXOCH'ARUE NUIMI IINAAR3 0mol)F- oftSTOMA1M MSXWF DMI OYROWLI AINoO N*"=I .VW MOMH DAY:_ E AR MO-nT DAYFwI 0o 1 9 10 I 10 11 ITOI 0 1 O1l015 1ll NATIONAL POLLUTANT D0S, ARGE ELBINATION SYSTEM (ES)OmCHmnw srom ruorepumPERWTTEE NALWDRSNwAM a Qus Onm~ Op' LW-DRE 4300 WU Floodwanur~K dos"Meegs'sonm 0MAJO(ame 01)P. MKLgTomAMWAUNDIVW13MWOVER.LO

-O1ATI -I IrI YAR WMON I DAY YEARI MONTNI DAYFAQLITY ftW~ baeift PiNt 9klonLOCATION 4ao Nomh 0mm Ch~ RWedGPMun L 01010Fmm:lw 0 1 I1 0 1 0 11 T 0 91 0 13 1 1 10*

NO jcNARO l..

ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit 1L0048313 May 2009BLOWDOWN TEMPERATURE MONITORING:

DateCalculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)05/02/0905/09/0905/16/0905/23/0905/30/0912012012012012077.883.180.189.086.2Note: Station procedures derive the Calculated Maximun Allowable Blowdown Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit.

theCalculated Maxiunw Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of May 2009.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/AkLbyr..hymcbktkkIrowbyddMR~aaW1WI\ayO9 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit H.L048313 May 2009COMMENTS:

1. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 31 of 31 days.k:byr-csbmodbkMoAVthidyDMR~a~taOIMayo9 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION DoMinir imUI U -205/01/09 30 3005/02/09 30 3205/03/09 30 3005/04/09 30 3005105109 30 3005/06(09 37 3005/07/09 30 300510/09M 30 3205/09/09 32 3005/10/09 30 30HALOGEN DOSING CURVEConcentration of total residual chlorineihalogen vs. minutes of chlorination period.Date: 05/04/09Time: 11:42Analyzed by: M.P.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than this limit are reported for information only.A0 25 50 75 100 125Minutm150 EXELONBYRON STATIONPrmit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION UD TIme05/111/09 40 4005/12/09 40 4005/13/09 40 4005/14/09 30 3005/15/09 30 3005/16109 30 3005/17/09 30 30HALOGEN DOSING CURVEConcentration of total residual chlorinethalogen vs. minutes of chlorination period.Date: 05/11/09Time: 1 I08Analyzed by: T. M.Reviewed by: D. M.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than this limit are reported for information only.o.5o0 , I ] i I i ,..0.48 -T T T, ,0.45 6 LfL4.4 1 10.48- 0.38 -] t g, , j'0.32 -J .,0 , 30ti '4 I 1 , ,j -0 30 .2 8, -I 1 :0.28 J -' i1 if* i i -t-r- I , z zi zJ-i-0 .24 _ -r r -rI-:111I --K0.22 .. -T 1'o0 T 160.184- lj~~7TI0.162 -~ --~11L0.08- 1i -A I0 .0 2 --I I-..i- 1 I --r .,0.00 ......025s075Minutes100125ISO0 EXELON'BYRON STATIONPermit EL0048313 WEEKLY HALOGEN DOSING INFORMATION I-I UL-205/18/09 30 3005/19/09 22 2305/20/09 25 2505/21/09 25 2405/22i09 25 2505/23109 25 2505/24/09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorinethalogen vs. minutes of chlorination period.Date: 05/18/09Time: 12:23Analyzed by: M.P.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than this limit are reported for information only.0.50 -A# I +- T 1 -F -I Iii++ ...0.4 68 1 1 J TF I -0.42 L 19 iI0.44 -, -0.38. -- i *0.34 -I i'0.36 ,-i __0.30- ' 1 z Z0.2860.24 t T0.10 1, ---- I0.0214-___-

001o.08 ,0.v0.04- 1o0.02 -! l i0.00 -+ I I i0255075Minutes100125150 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes)

U-I U--205118/09 30 3005/19/09 22 2305/20)09 25 2505/21/09 25 2405/22/09 25 2505/23/09 25 2505f24J09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 05/19/09Time: 10:11Analyzed by: M. P.Reviewed by: Z. C.Unit: 2Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.480.440.420.400.380.360.340.320.300.280.280.240.220.200.180.160.140.120.100.080.060.040.020.00IIM '+ ELL'0255075Minutes100125150@0

0. aEXELONBYRON STATIONPermit B-O048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes) 05/18V09 30 3005/19/09 22 230512(V09 25 2505/21/09 25 2405/22f)9 25 2505/23/09 25 2505r24109 25 25k ---------- IHALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 05/20/09Time: 10:25Analyzed by: M. P.Reviewed by: 7. C.Unit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.2600.240.220.200.180.160.140.120.100.080.060.040.020.00I I-1 --0255075Minutes100125 EXELONBYRON STATIONPermit IL0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes)

U-I U-.05/25/09 25 2505/26/09 20 2005/27/09 24 2505t28/09 25 2505t29/09 25 2605/30/09 27 2705/31/09 25 25HALOGEN DOSING CURVEConcentration of total residual chlorine/halogen vs. minutes of chlorination period.Date: 05/26/09Time: 14:10Analyzed by: G. S.Reviewed by: D. WLUnit: INote: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than this limit are reported for information only.0.500.480.460.440.420.400.380.360.340.320.300.280.260.240.220.200.180.160.140.120.100.080.060.040.020.00--:11100255075100Minutu125150175 Exelkn.o~o C0,w..ý Nuclea, "P r"IJuly 21. 2009LTR: BYRON 2009-0079 File: 2.09.0411 1.10.0101 Illinois Environmental Protection AgencyWater Pollution ControlCompliance Assurance Section #191021 North Grand Avenue EastP.O. Box 19276Springfield, IL 62794-9276

Subject:

Byron Station Monthly Discharge Monitoring Report.In accordance with National Pollutant Elimination System (NPDES) Permit Number IL0048313.

issued September 8, 2000, we are submitting the Discharge Monitoring Report for ByronStation, Units I and 2. This report covers the period of June 1, 2009 through June 30, 2009.It there are any questions regarding this report, please contact M. Stanley Kerr, Chemistry

Manager, at (815) 406-3200.

Respectfully, Plant ManagerByron Nuclear Generation StationBJA\ZC~sdk Attachments

-£NATIONAL POLLUTMIT 019(WARGE SJMINATION SYSTEM (WPOES)00CARMUW

ýfP 0PIEFOAEE NAMF/AD00*SS NAME Exftn Osnermn Co., LLCADDAESS 4=W WWhl RoadWarrnwwf, L 60666FACILITY ftmo ftx6r Pow ShmowLOCATION 4450 NOMI GuM"n Chinadi fedDPWm.I LGI101I .. .sIiiI IAIl 0.., ........

.... -.. .. ., II .....I pewrI I -0 4R NUBEW.RALARS4RU WA... pop,~HRSWMAR MONTHI DAY_ YM N1 yFrot 1 0 9 1 0I01 6 1 0 e OlI G 3016 0 NATIONAL POiLLUTIT DISCHARGE ELIMINATION SYSTEM (NPOES)--00010 m' i8m1PEIAMUTEE NAWEAOOAESS NAME Em.Om Oonomaa Ce*.. LLCADDRESS 4300 WWWgl RoadWa~novw.

IL 60566FAGUUJY aiOnm ft&.ow Powr SeagWOCATION 4460 N*0V QenwuA ChUr~h RQad&Inn~ L. 61010I L00MU3I wEITKM ERAW aI DISCHARGE NUVJ"MOMTOCIAG I-~YEAR IMONTHI DAY _EA I IL10BW DAY Iocinml(SlUR @1)OEIA 8 GNI RATE 4001*1Fmm 0 1 0 1 0 1 8 1 0 II] T1 0 1 9 1 01 6~ 1 0I -I -I -I NATIKtA&

POLLUTANT DISCHARGE EUJINtA11O SYSTBM (NF'OES)PERITrEE NAMEMAOARESS ItAA emion Geetmin CW. LLCADDRESS 4300 WWWWl RoadWangws".

IL $06FAcIOiTY Syro MuAW Pows SftmWOCAnON 4450 NOeM 0mM Chuxh RoadB~a & i101I LOSEISIS

I PEWNMWMI -II -o~fpo O(SUSA @1,SIP EMUIT (FORMER 1Sh)no Dow~Fm& 1 0 1 9 1 0 1 6 1 0 1 1-1 ToI 0 1 1 a01 6 1 1 1 0 10 0.NATlONAL POWJTN1rT DISCWHAE WMINATION SYSTEM (NPOES)-wwm -mm wpuPEtA~rrfIENAME/AOOFISS NAME Ekabo Guwmaon CO.. LLCADORESS 4300 Wbke*d PoadWatronvils, IL 0666I N06631ON 00U0otj ,'NSum,~. 01)MWIP- O61CEFwSwo~awo

_ * , * .EIPACIUTY Slwon tMocha Ptwr M~~LOCATION 4450 NaisOM nw C~mn DU RoadSIm,'r IL 61010nMOMITOJWPENC I Im RO i 0 1910 6 1 j i0 06 N ulo sclaoA" m...

NATIONAL POLLU)TANT DISCHARGE ELIMNATION SYSTEM (NPOES)0114WM 10M N NW -11111PEfMOTrEE

4AMFIADO~k$S NMAE Emsobn Owwwabn Co.. LWCAOORSS 4300 WkftM RoadWiunwis.

L 40661N40m1IsC1I 0I dflvM0 NUMEIO O --.W-MAJORF -POOALWNWTPF 0CFAOL"T DPWx K~~. PoWW Simon V EAR I MONTH I ThEY I I EAR I m .FWI~LOCATION 4460 Nw~oaGom wCh~te Rood Fwmiff0 9 01 S10 0 ITO. 0 0 0 6 13 0Opeon, L 01010 0NATIONAL POLLUTANT DISCHARGE BIMNATION SYSTEM (NPOES)PEeA&ATEE NAMJAoRsSS N"M Gawn aOsmba Cm. LWCACOAESS 4300 WVV*W ROWWwmanvif.

L 6OW6FAOULTY *= tonIciw Pwr SsbonLOCAWlN 448~0 NwGmon ChwdR*Bymo. L. 61010I UHUmSI Iof" 0I OWNMMEI I OW- NWH-BEm---Uso"Ovw I Mom"h I A I mAIF -FINALRASUM TmA1U (F0RMR @51IV)NO OCISOAROS jFmmi 1 0 1 0 1 0 1 4 1IToe] 01910101 31Of NATIONN.

PCLLUTANT DISCHARGE ELIMINATMO SYSTEM (NWOES)mONOA =WORM RwN 0"POWAITTEE t4ADIEAOOAIES NAME Eol oGsom~ Ccl. LWCAOORESS 4300 WhOW AIedWMTWIVEB, L 60650FACILITY Wb~ow ft~acs Pow 8"MoiLOCATION 4450 Nodh Guemusn Church Rced8ftyP L. 61010I ,S, llI -ILAý voI Imi 0BQsa -LWMffF4PERM WEAR IMONTH OAY IdA I wImONH I OP'tft 0 1 9 1 0 1 S 0 j1 TO 1o 0 1 S 1 0 1 6 1 3IK4mF. FIN"XTOWWAIWOVýQffl%

y0 00 WOMAN= 1:3 INATIONAL POLLUTANT D1SCHARGE ELIMIATION SYSTEM (NPOES)o-KNVJM -O0eT01WI w m0mPEPAATTEE NAME.IADOMESS NAME Eyuion Am i -m Co., LLWADDRESS 4300 W^Wisd RoaWuirewft.

11. 40566LwAMM$m 0aOOCKMae -AINA"P(s" 0)IF FALM6U1111WA1U 4OVIIIII168"g STOMAZ!FACILITY Btmn Mos P Swei onLOCATION 4460 Nool Genw Ow RoadayMn L 610101 l W l t oV IYEA MýIOM I DAY I U w IMONTHI DAY IFtot 0 1091 01 61 01 1 ITo. 1 0 1 910 1691 31 0 1... 0 DmCHAft E......" lI -*- I -I -

m m -* SNATIONAL POLLUTANT DISCHARGE E~UMMTOON SYSTEM (NPOES)-1K~lftN inurIll 11r pflPEI*Ar-ES NAMEIADDRE$S NAME Emjnlf Gopwabon Co. LLCADDRESS 4300 Wuig RoadWawwmf. IL 606KAoolms1I f~ w lm@ER01" 01I ODISCARGE NUMER IVOWTCFW40 Pff=c~oOWI ovy LODWIWLUMfT... No omovARFACILflY By=Nuci jew Poý Sbiwi W AR I ONHI DAY I I YEAR IMONMHI DAYLOCATION 4460 NseshOnon ChsMh P400 Fmm7W -IO 06 IoII O 0 1 9o 0 1 0 3 10Dyma, L. 61010M&tMGM&

0.NATUNAL POL.UTANT ODSCHARGE ELMINATION SYSTEM (NPOES)mCM IMXNoGm fomr M-PERMUrrEE NWAUVARESS NAMIE Exmaon Oenrarao Co,. LLCAOORESS 4300 WbidW RoadWaurewwft.

IL60666FACTY Bktmi MOWge Po" SWaLWCATMI 4460 Iaum Getmmn OU00 PoAWgyro%' IL 61010IHA04lalWE*TMAMem o-OKU Num"AF- FUM.*TOWAvmON"DA Uw~f C.

Woaa nsI MOMOFW- PEFOODI[ WA MONTH DAY _j I MITI4 DAYIFwant1 0 1 6 1 0 1 0 1 0 1ITO: 1 lIG S SI 91 1 0 1I m .....

*NATIONA POLUJTANT DISCK4AAE ELUMIATION SYSTEM (NPOGS)-NI"' -UNWPwO AO NPE9*ArTEE NAMEIADOAfSS NAME 9 b, Gswomon Co.. LLCADOR6SS 4300 Whibsd PloadWaffenvfo.

1005"FACILTY "q~ tNg~AO Po" SIWaLOGATIN 4450 Noelh Ofeeman Chudm RoadByKnunL 610*0I UILmumIli .........

lImOI PfWNM'MIDOHO -UKI M AY I IVIM MO CHAYNAARI TOWAIW ANW AMUSRLNO lkilmM: 0a JFnal ol 0 1 010 1 ! ol0 IT1 o 0 1010161310

..aATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORTFor Exelon Byron StationPermit [L0048313 June 2009BLOWDOWN TEMPERATURE NMONITORING:

Date06/06/0906/13/0906/20/0906/27/09Calculated MaximumAllowable BlowdownTemp. (Degrees F)Maximum ActualBlowdown Temp.(Degrees F)12012012012084.583.791.194.4Note: Station procedures derive the Calculated Maximum Allowable Blo'4own Temperature based on existing Rock River temperature and a calculated maximum river temperature increase.

When the arithmetic sum of these values exceeds 120 degrees Fahrenheit.

theCalculated Maximnu Allowable Temperature limit defaults to 120 degrees Fahrenheit.

HYDRAZINE MONITORING:

There were no steam generator chemical cleaning solutions (or associated rinses)containing hydrazine discharged to the Cooling System Blowdown during themonth of June 2009.TOTAL QUANTITY DISCHARGED:

N/ATOTAL DURATION OF DISCHARGE:

N/Ak: byr-ch~bhtoadb\LtrkNOuth 1yDM\R~azta..4I VU=09 ATTACHMENT TOCOOLING SYSTEM BLOWDOWN LINE (Outfall 001)DISCHARGE MONITORING REPORT (Page 2)For Exelon Byron StationPermit 1L0048313 June 2009COMMENTS:

I. The weekly halogen concentration curves and daily halogen dosing time reportsare attached.

2. Bromine was not used this month.3. There was no discharge of steam generator chemical cleaning wastewater containing hydrazine in this month.4. Flow existed through this outfall 30 of 30 days.0k:bvr 4h~bwodbMctrruhhD yD1RjanctOI\JwniO9 EXELOFNBYRON STATIONPermit [L0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes)

J U -06/01/09 38 4006102109 36 3706/0 309 35 1606/04/09 37 3706/05109 40 3506/06/09 40 4006/07/09 40 40HALOGEN DOSING CURVECortccntiition of total residual chlorinenalogen vs. minutes of chlorination period.Date: 06/01/09Time: 09:34Analyzed by: J. D.Reviewed by: D. M.Unit: 2Note: The limit of detection for the instnunen as tested in the Station Laboratory is 0.02 mg/L. Allvalues less than this limit ame reported for inforrmation only.0.500.480.46-0.44"0.420.400.380.380.340.320.300.280.260.240.220.200.180.160.140.120.100.080.080.040.020.00_______ ______ I___________

______________

I_________________________

__________________

I__________________

_____________

-....--.--.-----.-.---

~---...---------.--.--~---

I025so75Minutes100125SO OEXELONBYRON STATIONPermit [.0048313 WEEKLY HALOGEN DOSING INFORMATION

-Doinnflax (Minutes) 06108/09 40 4106109/09 40 4106/10/09 48 4006/11/09 37 3606112/09 49 4006/13/09 37 .3406114/09 1 3M 40HALOGEN DOSING CURVEConcentration of total residual chlorine/Ialogen vi. minutes of chlorination period.Date: 06109/09 Analyzed by: J. W. Unit: ITime: 12:13 Reviewed by: D.M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than tis limit are reported for information only.0.500:48 -.... .0.460.44 ---.--......0.42.. .0.40. ....... .0.380.30 .0.34-0.32 --0.300.260.26 -0.240.22-0.200.18 ---_ _ _0.160.140.120.08 --"0.0840.04 --- --- ---- _ _0.02 ..... ......0.000 25 50 75 100 125 150Minutes EXELONBYRON STATIONPermit iL0048313 WEEKLY HALOGEN DOSING INFORMATION

_____ (Mi tes)06115/9 40 4006116109 40 40OW 17/09 18 4006118/09 40 3706119/09 37 4006/20/09 40 40 40 40HALOGEN DOSING CURVEConcentration of total reidual chlorineihalogen vs. minutes of chlorination period.Date: 06/15M09 Analyzed by: J. W. Unit: 2Time: 12:52 Reviewed by: D. M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg/L Allvalues less than this limit are reported for information only.0.50.0.48 ----- --________0.46 0.44 ,.0.42 -----0.40 _0.38 -0.38,0.340.32 -_0.300 .2 8 -.........

.... ..0.260 .18.. ........ ...... .-0.16 ...0.14 --.. .0.12 ...0.10 .51100.040 .0 2 .--..---..

... ....-... .... ...0.00. ... ...... ..025 so 75 100 125 150Minutes8 EXELONBYRON STATIONPermit IL048313WEEKLY HALOGEN DOSING INFORMATION (Mi tes)06/22109 35 _ 4006t23/09 37 [ .3M4/09 40 4006/2309 35 .406/26/09 6 4006/27/09 38 3906/28/ 35 40HALOGEN DOSING CURVEConceninition of total residual chlorine/halogen vs. minutes of chlorination period.Dotw: 06/23/09 Analyzed by: M. H. Unit: ITime: 11:39 Reviewed by: D.M.Noe The limit of detection for the instment as tested in the Station Laborutory is 0.02 mSIL Allvalues less than this limit are reported for information only.0.50 t0.418-0.46 ___ _0.44 --____.......

.0.42 4 .. ....___....--0.38 j -- -0.340.32 .....0.30 -0.28 _0.260.220.240.20 -__0.180.180.140.120 " 500.08..n.0.04 .. ...0.020.00-0 25 so 75 100 125 ISOMinutes EXELONBYRON STATIONPermit 1L0048313 WEEKLY HALOGEN DOSING INFORMATION (Minutes)

U-1I U-106/29/09 35 340of"/IO 34 33HALOGEN DOSING CURVEConcentration of total residual chlorineihalogen vs. minutes of chlorination period.Date: 06/29/09 Analyzed by: M.P. Unit: 2Time: 13:42 Reviewed by: D. M.Note: The limit of detection for the instrument as tested in the Station Laboratory is 0.02 mg(I Allvalues less than tbis limit are reported for information only.0.500.480.46 -0.440.380.400.380.34--0.320.300.280.240.24 -- ----- ----.-0.220.180.14---0.120.100.08 .....................

... ...0.08 .----..6- --..~ ----~0.04 4 --- -~W 0.02 --. -.... -- ........-.-..

-.. .........

.. .....0.000 25 50 75 100 125 150 175Minutes

ML14007A094

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